Yeah, I know, it sounded ridiculous, but technically it was legal by the bare rules.
Like you said, I wouldn't allow a cheerleader, but I MIGHT allow, say, a lieutenant for this crack commando unit -- a charismatic/soldier that isn't as good a shot as the others, but has a knack for getting folks to work together -- and for getting them to survive.
Maybe as the sniper is getting ready to move into the position, the lieutenant just puts his hand on his shoulder and whispers, "No problem, man. You can do this." And coming from another one of the guys, it would be some empty gesture, but somehow, knowing it came from the lieutenant, there's something greater behind it (Like, er, the lieutenant making that Cha10 check to do the inspiration). The sniper realizes that he can do it, that the lieutenant believes in him. And he shoots a little better.
Campy? Definitely. Kind of a "Saving Private Ryan" moment. Tom Hanks does a decent job as either a Smart/Charismatic/Soldier or a Dedicated/Charismatic/Soldier -- can't tell which. But it might be worth allowing, if only because the Charismatic guy gets a lousy attack bonus and only defensive combat skills, so he ought to get to have some fun.
But yeah, like you said, if someone went all D&D Bard on me and started humming the Battle Hymn of the Republic to make that sniper more effective, I'd start throwing eight-siders.
-Tacky