Hey Andy,
I think it's not a bad idea for those who are looking for some feedback, and are not afraid of criticism or the occasional troll. I don't think it's for everyone. Personally, I like to keep my writing private, and the only opinion I particularly care about is that of the person I'm writing against.
However, for those who'd like the feedback, an idea popped into my head. I'm not sure how feasible it would be, but possibly there could a separate sub-forum set up in the con-crit section, where people could create a comments thread, and link to it from their main roleplay thread. That way the only roleplays which would be receiving comments would be from those writers actively looking for feedback.