Lock button

a lock button or a neutral button on the bottom right of attack screen and now that I'm thinking about it maybe on base screen too. This button would make it so you couldn't accidentally drop troops while your scrolling around the base

 

Lock that construction, remember the last zoom level, and remember where those traps were between defenses.

 

I don't really had any trouble with those. sometimes a single gunner but nothing serious. I always make sure to touch land when scrolling or make a fast swipe, that will prevent unwanted deployment of troops

 

Using two fingers at the same time really prevents this problem

 

And a lock button.. pretty sure that would be a pain when you're trying to deploy, but it's still enabled