Weapon specialization and Nailz fingerblades
should be avaliable.

I think the title pretty much says it all.  You should be able to have Nailz as a weapon specialization.

Ya, while I can agree that this is the doucher weapon of choice (tho not everyone that gets them is a doucher, hehe)  It's a cool weapon, that's been around a long time, and should get this love.

Nailz are a weapon just like anything else and you should be able to specialize in it.  It's a limitation of the code currently.  If someone were to @bug it I would see that it got fixed.