Here's food for thought though.
Gry's a great guy, but he is a Loki. And this community has more than just one Loki. Now I can be pretty sure he doesn't use big jazz to his advantage in competitive games, due to server restrictions, yet, from what I understand, there is no way to make sure gry doesn't use this, whereas the rest of us still have to switch ammo, correct?

In which case I can only say this:"Legalize it, Mr. President!"

Because if the possibility exists, that someone is using it, then we can't take the risk of not using it. Since prevention in jj2 is very hard, if just one party/clan/group of players use this, it could potentially give them a considerable advantage over the rest of us.
Me personally, I'm not sure an RF button would help me that much for movement, but it would be a nice addition when you're trying to kill enemy with flag if you've previously already hit him/her with seekers. You don't need to swap to 5 (i often hit 4 instead of 5 and vice versa) and you can kill of the flagger whilst telling your flag to do a rush. I actually wouldn't mind a gun 9 button as well

EDIT: Gry, don't take this personally. I mean you have all the right to, but still, think yourself more in the terms of a general example (if you can) If not, the count is sorry

@Stijn: Rocket jumping turned you off Quake3?? Even I can do it, and my aim stands at 15%, my movement is far from spectacular etc... And besides rocket jumping attackers in CTF games are exactly what a good snipers in QL live for: whilst in the air they are very easy to kill. While saying I can do jumps, I have to admit I've seen the pro's do some incredible jumps that I still don't think I could do in a serious game. Hell I probably couldn't do them in an empty server either