Any TMP system mustn't enable any kind of vicious circle, or we're all !@#$ed again. I'm highly sceptic of any kind of TMP. In favour of more rogues, though.
How about rogue as an actual "faction"? Atypical in that way that it doesn't have a government or anything, but nobles could leave everything behind and live off of plundering for themselves. Free for all, basically (also vs monsters and undead)