Let's be real Ender. I said "I want to do Guntoss, I go first." Then you tossed yours, and I rocket tossed mine. I then got given another gun by you, and shot you, for I won the GT. Neither side said "no rocket tossing", just like no bunnyhopping wasn't said, neither was "no strafing", or any other hyper-specific modifiers to the LR that I'd normally give depending on who I'm going against.
Rocket-Tossing may be considered "cheating", but I didn't specify "no cheating", and as it was my LR, a CT can't tell me what I can and can't do during it, so if I don't say no RT, then RT is allowed, but if I say no RT, then RT isn't allowed.
On a side note:
Actually, if a T shoots twice during a S4S LR, typically the S4S CT is the one who kills the T, so for the T cheating, the CT cheats. I don't see the T as a rebel, just a cheater, and alls fair at that point.