Why wouldn't it be allowed? Unless I've missed something there's not much difference between this and every other crapcoin signature campaign.
You seem to have missing out an important point here,this isn't that usual altcoin bounty signature crap,this is an advanced bounty signature crap which has a definition of it's own " PoBP (Proof of Bitcointalk Presence".
OP,have you planned to run mining operations of your coin from bitcointalk signatures in the near future ? I'd love to witness the tech that your project promotes.