All,
I've created a standalone Windows app that allows you to customize your AC3D toolbar. You can add just about any AC3D menu function as well as many plugins and a few extras, and can label/order them as you wish.
http://supercoldmilk.com/ac3dplug/ac3dtb.html
While this is a Windows-only application, the output from this program is a TCL file (plain text); so, if you are using AC3D for Mac/Linux and have access to a Windows machine, you should still be able to use this app and copy the results to your AC3D scripts directory.
Please post back here if you encounter any difficulties using this app.
Enjoy,
Dennis