To answer two questions... I dont know how to change the hotboxes Furinex,
BUT if you copy the EQUI_hotbuttons.xml From your default folder to the Vert folder it will use the default hot buttons instead of the ones seen here.
I am sure Vertebrae will be working on some interchangeble pieces as he goes along..
I have also found that any XML changes will use these graphics if put in the Vert Folder..
experiment at your leasure and find what works..
Kudane