Extending on the Idea of an RP Forum/subsection, not knowing how hard this is to be implemented
A Site I have been on previously had an own RP Section. not in the way of a Forum, but as an actual Section.
Images:
Managing and administrating your RP, including who plays whch character, what characters are there, adding characters, how many players, what theme, entry restriction etc.
Character creation. Images can be added as well as a default for the player state, Images for the character and a brief description.
the RP itself. the Poster can select between all characters assigned to him and post something "In-Time" (meanng the font color is black and counts towards the RP) or not in time (Text is grayed out and is taken as "off topic") as well as Action (Italic font. means the text is taken as a description of an Action) or as non-Action (as a said text)
This system is more accessable, especially when RPs are Understocked or when people are using multiple characters in general, like alternate versions of a character (Vampire Form and Human Form, for example)