So far, I've tried the following
- change "reject_attack_commands" from False to True at the infantry_support_mp ebps file
- change "attack_ground_type" from not_allowed to anywhere at base_building_flak_20mm_flak38
The first change allows the player to manually pick targets for the T4 building. However, no matter how hard I tried, I can't seem to be able to get attack ground to show up

Am I doing something wrong? Is the attack ground ability only linked to squads (e.g., Bofors, etc, etc?)