Why do players need to know that they're banned for DM?
If I may add here, it will be cool if they are just marked so every other player know that he wont be able to leave LV, no matter what.
That way , he will "suffer" of constant harassment (and I mean, kill-wise) by other players. Remember, banned for dming doesnt mean he will get a "forced Vacation" in LV, it should mean, "..and now you will suffer has your victims did."
Last night I AJed a player, and he got a 5 days ban in LV. I warped to him and he was so "happy" that he will be only in LV. "I hate LS anyway" he said. Funny, but as I said. "Forced to be in LV" new punishment should have some extra "hard time" for them, as I mentioned above.
Let me put an analogy here. "What will happend to pedophiles in prision, once the rest of the prision's population find out what he did?". Let those auto-ban for DMing players suffer!
Also, and I dont know If this has been done yet, don't let them been able to take turfs, or able to get the Briefcase mission or anything that can generate them money (even CITphone money transfers, in case they want to use their "other accounts" to play in LS and SF) . That way they will have to spend their own money to keep fighting, and trust me, +5 days in a row in LV ain't cheap
.
To sum up:
MARK them in map, with a bullseye icon (or anything that come close to it) so other players can "feast" on those "unwanted" DMers , (hell, even a nice message of "Cool! you killed a Dmer!" every time a player kills them.
) and
Don't let them receive any kind of money,working or money transfer , so they have to spend money at hand + bank account.
Just my 2 cents.
Peace!