Its extremely hard to implement a feature which checks what the user edits. Because bushes, trees, walls are client side not server side so its impossible to tell whether or not a user uses it. Even if you make screenshots its still hard to tell if he/she is exploiting or not. So far currently none of the warband mods can detect a user from editing stuff so raging it here will be pretty pointless. The only game mode that can gained an advantage over this is probably battle, in siege hiding in bushes doesn't help you much at all.
In native and mods in warband option there is a thing calle Grass Density, set that to 0 and it will completely remove all grass on the map. If the devs is going to implement a system to detect self-edits like this. i can't imagine the amount of time is needed to implement this to work, but it is better to work on something else like new code/ new system instead of wasting time on this.
if you want less people to use it stop bringing it up to the public or else more people will use it eventually.