When you cast a melee touch spell, and you don't hit with the free attack you are allowed to make(or if the touch spell has multiple charges), you can keep attacking with it the following rounds to try and get it off.
My question is, do you have to make each touch attack as a standard action, or can you attempt to two-weapon fight with the touch spell, effectively giving you two chance to hit, for a small penalty on that roll.
Additional, can you make multiple touch attacks if you base attack bonus is high enough to allow for iterative attacks?
The question specifically relates to Chill touch, which has multiple charges based on caster level, but i guess it's the same for a touch spell like Vampiric Touch, at least until you hit the first time.