Very tiring control. It should be hover to spray, button/key to foam, button/key to change radius (can't observe the effect of change radius) .
Radius change requires the nozzle to be upgraded above lvl 1, once it is it becomes very noticable.
By hover to spray you mean without having to hold down the button? I might make it another Supplements upgrade if people like it.
Yes, spray without click (now 1 click), foam with 1 click (now 3 click, switch-apply-switch).