I was curious if any have tried to do a movie or tv series episode as an rp, but have it be like a what if (old marvel comics series) where the pc's could do something instead of just exactly what happened in the movie?

I've noticed it seems they have combined 2 movies onto one disk.  I was just curious if these are double sided disks, single sided.

Hope you don't mind a few, maybe silly and often asked, questions, not sure if this is the right place to put this or if the general thread area would be better.

In rp's does is one limited to Feature Characters mainly?  

By minor characters does one mean the original character can only appear in a limited sorts of scenes, like certain of the character's parents in some of the movies?  

You can only encounter one of the main characters in passing or not at all?

Being one of the siblings of say Ducky or Petrie, the only ones who seem to have a number of them, being off?

Like in the movies and episodes is the rp based around the 5 main characters, or do the other characters have things they can on do in the rp threads, even if it has little to do with the main thread plot?

Any sorta tips on someone new here who may be interested in rping here?