Well, here's the list of things i found I'm able to kick. It may be helpful in the matches, since it increases distance (just like *can't remember who*'s post for vortex)
Anyway, here's what i found out i can kick:
Mug flame&ice
avril rockets (if timing is right you can repel it)
vortex
redeemer missiles*
proxy mines the moment they're shot*
spider mines*
grenades
RL rockets*
rockets in general*
and other thingies...
I ASSUME everything, which isn't InstaHit and is mesh based works... Also, all pawn weapons work (Redeemer missile is a projectile AND a pawn).
Mabye you can even hit firemines, needles, needle balls, and even turrets? I'm not so sure about the turrets, but worth a try...