Dungeon Leechers are becoming a growing problem

[Zakalwe]

DF is a FAIL because it's cross-server, therefore the sanction of bad rep. on a server meaning you're highly likely to be avoided just doesn't apply. WOW showed this when Blizzard added CRZ, and already dire community spirit actually plummeted further downhill after that.

This, exactly! All of these problems and the corrosive affect it is having on the game's community would pretty much sort themselves out if DF covered only your own world. Griefers would quickly find them largely blacklisted from group play as their reputations built and also find themselves locked out of all decent FCs.

Edit: similarly, it would make instituting a kick function easier to do, as abuses of kicks would also open a person up to the downside of developing negative rep.

[Panthan]

Only thing SE can do is giving us a vote kick system, beyone that there is hardly anything that can be done. This is something Cs watchers wont like, adding a kick immunity during cs can be abused by afkers.
Activity based doesnt work, its not hard spam a random button and easy to exploit, both ways.
Blacklisting on 3th party sites dont work, its too big a hassle to search through lists of names to see if someone is worth your time, not to mention easy to exploit, X won the loot Y wanted so X is now on the black list site.