As cool as it would be, Jagex won't do it as they are far to over-protective of their younger players, most of whom already do swear, and not the mild ones Jagex lets by, lol. I would still prefer to use Teamspeak and Ventrillo over a RuneScape voice program, mostly because you don't have to deal with idiots and worry about getting muted/banned for dropping a couple F-bombs unintentionally.