I understand that isn't really helping the team, but unless seven people get on and start doing it, I have never noticed an increase or decrease of my teams ability to defend the flag, and more importantly, I never had less fun either. There's something funny about blowing one of those guys up, but even funnier when you just go "Aw" and run past it, only to get stabbed in the ass for your hubris.
 
Our servers our busy enough that the people waiting in the que appreciate it when the admins kick useless teammates from teams.

If spy crab really is their hardcore fetish they can find an empty server to crab on.