Granger' solution would fix the problem.
I would even make a mini region around the local ressources scents free because in a few days/weeks these alts will have rage and won't log out.
The situation at the moment is completely stupid , local ressources are meant to be rare and something you fight for.
sure disabling nidbane for them was a good step but it fix the problem for a few weeks only and you can't compete with an abuser with 10 naked alts at 10 different spot that risk nothing at all but 10 minutes of his time.
auto log out make the problem even worse , you can't even kill them.
I tried multiples times ... and just killed one who was noob enough to just sit afk without auto log out.