I've been looking through the code for Product Tabs and it's occurred to me that people would like to be able to turn some tabs on/off, make others default and in some cases, add a tab or two of their own.
So far I've found that the code files that contain references to tabs are:
includes/classes/class.product.php
javascript/product.js
templates/__Master/Panels/ProductTabs.html
Plus of course the admin sections that control them..
From what I can tell it seems that disabling a tab is relatively easy with just a few comments prepended to the offending Tabname[footab] variable in the JS and lang.footab variable in the ProductTabs template.
The rest of it is a bit more involved but most people seem to prefer the approach of hacking the language file to either take over the Product Warranty or expand its role (ref)