Great, guess I'm going to have to find some other way of giving orders in combat situations. Or more likely accept that we're going to have to be more disorganised as a direct result.
Why couldn't you just lock it so set messages only work in group chat?
Also Savi in SFC chat just hit the nail on the head, they'll just use stuff like shortkeys instead. It won't stop them 1 line engageing people, but it will stop us using them to co-ordinate under fire.