As far as I know, we've always been open to any kind of proper text-based RPing in the Roleplay Corner, but each thread here has its own rules and mechanics. To start up ASB here would require people who know the system, people who have time and energy to invest in it and it would surely require a new section to be created. At least a subsection to the Roleplay Corner.
If it's something that can work well in a single thread (or two, we usually have discussion threads linked to each individual RP), you can probably try to start it up whenever in the Roleplay Corner. As long as it follows our general RP rules. But from what I've seen, ASB is a big machine with different threads for different parts of the... thing... right?
The simple fix: go to another forum that has ASB already ;) But keep posting on PC for everything else!