Colonists will keep mortars ready to fire at a moment's notice so you don't have to micro-manage them.
Adds a basic work type for colonists to man mortars automatically until those mortars are loaded and off cooldown. Colonists will not fire mortars unless manually commanded to man them.
Readying individual mortars can be toggled on and off.
Not particularly compatible with existing saves, however it will work if you deconstruct and rebuild all your mortars.