First of all, awesome plugin. It was a saving grace when during the minecraft.net outage on Saturday when I was able to remotely set online-mode...
I'd like to see the ability to change the world/directory name for the nether world. I'm running across a few other tools that make assumptions...
I know that Nether 1.0 (haven't tested 1.0.1 yet, but it shouldn't be any different) does not require a modded client. Also, it's the only plugin...
Separate names with a comma.