I've never personally used RW, but from the few people I've talked to who have used it, they told me it didn't increase their ping at all (on 2048/384 cable). I've never really used a program like that, though. The only real place I've seem them used is clan matches for games (Q3:TA, to be exact). At LAN parties we've done teams in separate rooms, so we could talk to each other freely, and it worked pretty well.
General online games probably wouldn't be great for things like RW, because people rarely actually work as a team, so it'd suck.
Sorry I couldn't *actually* help :P.
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