As it is currently, I must manually create a specific stone type for say Message Boards area and likewise. I think it would be much easier, exactly why you have insert, to insert additional id's onto the blacklist for the given flag.
Unless I missed something on the wiki on how to insert them. I didn't see a way other than creating additional stone types.

I would like to have a function like..
/ps addblockid prevent-place-blacklist 6

and likewise
/ps remblockid prevent-place-blacklist 323