Customer service response:
A few question about the Weapon Focus feat (or, in fact, about any
Weapon-specific feat).
Weapon focus can be taken with any weapon, Unarmed strike, Grapple, and for
the various weapon-like spell effects (Ray, Energy Missile, Touch spell).
1) Weapon Focus (Unarmed strike) will have no effect if you deliver a Touch
spell (unless you make a normal melee attack that causes damage), correct?
-Correct.
2) Does Weapon Focus (Unarmed strike) help with Melee touch attacks that are
made in the various combat maneuvres? (For example, when trying to initiate
a bare-handed Trip attack)
-Yes.
3) Say i have a Touch spell active, and I have the Weapon Focus (Touch
spell) active. Would I benefit from it if I tried to initiate a bare-handed
Trip attack?
-No.
3a) Would I incur an AoO (since I am considered armed)?
-Yes.
3b) Would I damage my opponent if my initial touch attack succeeded?
-If the spell does damage, then yes.