No and that's why some places have multiple themes. But having more than one theme is up to the owner.
upgrades break themes forcing you to have to go find out what's broken and fix it. PITA... Besides VB
has gone and done something so incredibley stupid that makes creating themes or using packaged themes difficult. They have moved stylevar functions from one stylevar to a group of others and disabled many of the stylevars. Now you have to go to the css templates and turn them back on. STUPID!!! Instead of keeping it like it was, simple, they have chose to make it harder. And they wonder why no one is making skins for the VB4 series.