I realize that I can edit the code itself to grab my custom group but if there's a "standard" way of doing this, I'd much appreciate knowing it. I'd rather not change any of the original XOOPS files.
Now I will see if I can make the HOME module highlight as well.
The answer is in XOOPS itself which contains the code to make cookies work correctly. It was commented out in one of the updates because of a potential security risk.
Check out how it works on my site at VarLinux