I needed to add a second account to my local machine, and then wanted to share my jEdit settings. It's documented fine, but I wrestled with it way too long, so here's my summary:
In the jedit dir, run jedinit.exe.
In the Options for jEdit box, enter the appropriate modifications to the following:
-settings="C:/Documents and Settings/Chris/.jedit”
and ... whalah. Shared settings.