Oh, darn, you're right. I must have not rebooted before I created my .xmodmap and the original call to xmodmap -e was still in affect. I'm going to have to re-read the thread that originated this solution.

In the meantime, I created a oneline stowaway.map file and placed it in the directory you mentioned, pointed the plugin at it, and now it works as expected. Had to gainroot first, of course. Hopefully we can get a non-root method to work. Either that or just get the distribution to include a stowaway .map file