Do you mean for when you click on the ammo crate and you are waiting for the player to get there to get ammo? Good suggestion, I will add something in for that.
Yeah. It feels awkward that the game makes it seem like it's click to get ammo, but it's click to move until your player touches it. It'd be cool if you could give the player the option to choose the ammo then choose the tower, then the player would run over and do it, or at least if it popped up with some kind of response (particles, sounds) where you clicked either way.