I've been using LsDynamic to work out the effect with Layercut shortcuts ('cuz it handles circular paths innately). The fact that it also handles acceleration and transparency are major bonues. Can't make a dynamic popup with it, though, and I don't think my scripting capabilities are sufficient.

RabidCow, if you could implement a module that would do this, it would be something utterly cutting edge, and revolutionary for LiteStep. (hint, hint... everybody's seen and admires your work).

There was an old SuperNintendo game that had dynamic menus that did something like this (Illusion of Gaia? Secret of Mana? I can't remember). It's truly awesome to behold!