Of course!
RP Section Differences
On PE2K there's a who little sub-file thing for discussion of RP's and one for Other: Role Plays. You dont sign up in the RP thread, either. There is another sub file for it, too, where you post anything you would here, except for the RP posts. You can put OOC: in your post, too (that's why I do it here so much).
Differences in Fan Fiction Section
It is named Pokemon Fan Fiction, with the sub-file of Other Fan Fiction. You are not allowed to post ideas for Fan Fictions there. TIP: Ask your friends about the idea if you know what is good for you.
Just All You Should Do
All you should do is read the rules for each section. Those will be the Stickied Threads in a section. Have fun! =D