This is an old "issue" since OFP or Arma 1 I think. Before the game starts in lobby some nasty players have fun enable or disable AI on some slots although admin clicked on the "Disable AI"/"Enable AI" button.

To avoid this kind of problem only admin should have the possibility to click on the "human"/"AI" icon next to each slot to enable/disable AI for individual slots.

The players should have this possibility only if there is no admin.