Was just thinking of some ways to spice team modes up a bit and thought about powerups affecting the whole team instead of just one person (You could still have individual ones too of course).

Your team:
- Double Damage/Speed/Protection
- Regeneration of ammo/armour/health
- Team Invisibility

Opposing team:
- Half Damage/Speed/Protection
- Degenerating ammo/armour/health
- Team Visibility (Aura based glow, like quad or maybe even wallhack style)

Nothing special so far but there's scope for more I guess.
Thoughts?
Ideas for other powerups (non-team based too!)?