That's what the smart people would do when they recognized the Administrator or Herobrine would come up. It really isn't hard to get around critted minions. Now if they live, snipers would really only be the main thing to watch out for if summoned, because of constant crits to their sniper rifle. Spies, I'm sure a lot of us tend to have that flick reaction to shoot at a teammate as soon as we collide into him or her and we /don't/ go through them, so I'm not worried about spies.
I'd just say keep all minions to Taunt4Crits, and if people are REALLY that worried about snipers, just keep snipers as melee-crits only, requiring them to make headshots if they want to crit. Same regard with spies that utilize ambassadors.