I think press works for Caulk and glue. Stapler is used already for the machine that sits on a desk as opposed to the hand held construction style. Finger pointers is certainly descriptive but when people do “finger guns” the thumb usually mimics the hammer action. What else are they miming? Am I so inundated with gun culture I was unable to think of another use for the thumb?

I think bottles were around before firearms but Staple, nail and Caulk guns were not.