I am interested in doing stuff like GURPS or Nightbane conversions for ponies, and then coming up with rules on how the will have sex with each other. I'm not sure what board is appropriate for that. What are chances of a sub-board for it? Also when do we get 5 files per post like 8chan had?
/vx/ is appropriate for those purposes, as it has been host to Roleplay threads in the Dungeons and Dragons style for more than two years now, and is appropriate for roleplay discussion topics generally. There are no rules against ERP or explicit images there, as the only board on the website that is Safe For Work is /1ntr/. The ability to upload 5 files in a post has been a feature for several years now. Simply press the little + sign below "Choose Files"
If its ponies or politics related, the mainboard is fine. Funposting is also acceptable, though /sp/ is the board that allows everything.