Awesome. A new member, but better than that, a new member that has already gottn his hands dirty tinkering under the hood
Some brief history on the script.. it's based on phplinks circa 1999 which I didn't write. This coincides with PHP 4.1, CSS was still in it's infancy and Internet Explorer was beating out Netscape in the browser wars.
I've made a few attempts to make the current version tabless, using CSS positioning but wound up writing the core of the next version instead. (which will rock by the way

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Hrm.. no, currently no way to deactivate categories, but that is a pretty good idea.
As far as changing the general look.. Lots can be done by editing the style sheet.