I think it would be a good idea in theory to be honest which surprises me. The mods would have to be on the ball and posters would likely get pissed off fast but it would be a sort of we're all experimenting to figure stuff out forum. Unfortunately the way Bluelight has developed so far would make it extremely difficult to start up now. You'd take away most of PD, some of ED and OD, and a large amount of TR. Furthermore the term RC is just so general you'd be dealing with everything from sedative alcohols from the 30s, to new fangle stimulants, to synthesized opioid peptides, to hallucinogenics galore. I think it would be a good mission statement for another brand new site though.
If you wanted to group RCs together better in one location on Bluelight, I think the best way to achieve it would be trying to better define the lines between OD, ED, and PD when it comes to stimulant entactogens.