>make sentries target closest enemies
Each turret has a targeting type that works best for their purpose. If it doesnt work good then you arent using it for the right job. For example gatling and bolter due to their slow turn speed pick the target that requires least time to turn towards. If we made gatling pick the closest target it would literally become useless as it would be stuck re-acquiring targets without shooting anything then dying. It used to be like that early in development.

Otherwise, this suggestion is pointless. I dont see why we should screw with players' muscle memory for no reason. Selecting order variants, which is already something most people miss, shouldn't get even harder if you have to first click then select a variant. Having to move the cursor to the center to cancel an order would be inconvenient to say the least. That'd be ridiculous/inhuman UI design that is difficult to communicate.

Besides, what the hell does it have to do with "reading tiny text", does having to click instead of scrolling save you from reading?