Which totally means that this is AI issue and not currentWeapon issue. Bots simply deny to switch to the weapon they hold in their hands. Some sort of safety-trigger.

Nice guess, but it actually reveals target correctly (just tested). Actually when we first met this bug cursorTarget wasn't involved.

use key combination Win+shift+[Arrow key] to fix screen. Cursor bug is general windows bug which has nothing to do with Arma 3.

I have same issue with other games as well. Try changing main screen or changing the screen game is on at the moment. It should work fine on main screen. Windowed mode is solution as well if you can set borderless windowed mode and set window resolution to monitor resolution.

I hope you also come up with some sort of detection for planted bombs. Because otherwise implementation is useless. Lets say if oposing player can simply find out that bomb is attached by pointing mouse on the vehicle. There should be places where bomb can be attached for each car, which is a bit complicated -- each model has to be changed in order to implement this.