Once you enter a lucid dream, you might find it easy or hard to control. Here are some tips to maybe help/aid dream control, especially during nightmares or dreams that you can’t seem to control.
I have used the search feature for these and found nothing. So I will post them here.
There are certain types of dream control, from my findings. So here are all three types; “forced”, “passive”, and “verge”.
Also, please let me know if this was already posted here, because I couldn’t find it here.
Note: the information abut ‘forced’ and ‘passive’ control was taken from the dreamviews forum (forgot the thread & poster). I have put them in my own words, and used my own personal examples.
Forced Control
So we start off with a dream that is maybe hard to control. This is the type that will most likely alter your dream in the most profound way possible. Only use this when you become lucid during a nightmare, because it might a) have an unwanted effect on your dream, b) wake you up earlier, or c) (maybe) go the way that is planned.
Let me give you an example. Say you’re in a huge bathroom, the size of a baseball field and your house is about to be ripped up by a tornado. Sounds pretty scary, huh? Well it is.
What you should do if you become lucid is to analyze the dream, and ask yourself if these things are normal. It most likely will come across that it is not normal.
But the type of control needed here is to somehow stop the tornado in it’s path, or find some way to escape.
So you figure out the possible choices you may have.
a) Jump through the mirror and escape the house.
b) Exit the bathroom and protect the house.
Of course, any of these could go wrong at any time. Say you put up a magical barrier in which the tornado rips through and destroys the house, which will, of course, wake you up.
Let me give you an example of a lucid nightmare I had in January.
It was night time, very dark out, and there was a huge winter storm happening. The power went out and I did not know what to do. But eventually finding out that I was dreaming, I exited my room. I went out into the hallway, where virtually everyone in the house was gathered. I put my hands together, closed my eyes and said out loud, “I need light.” At first it appeared nothing happened, but I soon went back into my room and found that my monitor was floating and glowing with an eerie white light.
Also, here’s a tip: If you use forced control too much, you may find even your normal lucid dreams will continuously become shorter and shorter.
Passive Control
This is the best type of control, other than “verge”. Passive control is the most common, or should be, when in a normal dream. There are certain activities that are in either passive, or verge (discussed below) that how much of the dream it affects, and how profoundly, is strictly dependent on the dream’s context itself.
Flying is a great example of one of these activities. If you want to land, depending on the dream’s context it might be either ranked as ‘passive’ or ‘verge’, maybe depending on how hard it might be to land. Also I would recommend that this is the type of control that you use as it is the easiest to prolong your dream, and, unlike the others, it is harder to wake up when taking this type of control in a lucid dream. This type of control is not very hard and it is very general, in fact, even just walking around and stabilizing the dream is considered passive control.
Verge
This is the borderline of passive control and forced control. It can sometimes share some of the same effects as both passive and forced, and is just in the middle, hence the name. This is the one that I came up with.
Verge control is, as I stated before, very dependent on the dream and varies from dream to dream, needless to say from person to person.
This one isn’t the most dependable, either, even though some of the most fun things to do in a lucid dream are ranked in this category. Usually verge control has more of a profound effect on the dream than does passive, but it comes nowhere near as profound and harsh as in forced control. Sometimes you might even incorporate and use two different activities/methods at the same time. A great example is the use of flying and changing the setting at will.
Let me give you an example from one of my journaled lucid dreams, Super Tornadosphere Lake.
The dream started in a very weird setting. It was a mixture of a hospital, an office, and my school.
I was in the hallway near the Staff Lounge. I did a reality check, something didn’t seem right about this place. The reality check failed, so obviously I was in a dream.
I entered the Staff Lounge. Just in the corner, behind the door frame was a very weird green light-sort of thing. The green light (whenever you would think about it very hard) would open an imaginary “text” file, and whenever you would stop thinking about the green light, it would close it.
The imaginary text file described the setting I wanted to go to: a beach.
You know that whenever you read something, it is only natural to imagine it/visualise it happening, and dreams are only part of your imagination… right?
I read the imaginary text file, and I imagined myself holding on to a wooden pole near the dock on the beach.
It was evening, of course. When I did that, I saw the setting change around me to the beach I had just imagined, I was holding on to the wooden pole.
The beach was empty, but the sunset was beautiful!
I thought to myself, “This is the perfect setting for flying!” So I attempted to fly.
For the first time ever, my attempt was successful!
When I was in mid-flight (high above the water, could no longer see the shore) I saw four Wind-Waker like tornadoes, in a square shape. They were below me, but the wind was hindering my flight path!
I then decided, “Hmm, if that’s gonna happen, why not just swoop down into them to attempt to destroy them.”
I swooped down into the four cartoon-ey Wind-Waker tornadoes, and I got caught for a few seconds.
The view then switched to first-person (it was in third-person earlier).
Suddenly, I violently spun very hard to escape them. It worked! And I managed to destroy two in the middle of it.
Then I woke up. “***,” I thought, “That was fun!”
Now as you can see, I didn’t take forced control, but I didn’t exactly take passive control either, because I changed the setting and I flew into the tornadoes.
Sorry if this wasn’t very informative, but what matters most about what type of control you need to use is mostly dependent on the dream itself.
Recommended Activities:
Forced:
Correcting nightmares
Pretty much everything else in a nightmare 
Passive:
Stabilizing
Walking around & exploring
Looking at the sky!
Playing videogames and “saving”/“loading” your files between different dreams
Flying! (depends on context)
Etc… (cannot think of more things currently)
Verge:
Flying! (depends on context)
Sex
Racing
Generating/flying into storms
Ecstasy/drugs (depends on person/context, you might not like this one)
Morphing yourself/DC’s into different things
Most/all of those other fun things
Also, if you might need more information, you can look at Stephen LaBerge’s video series on dream control.