To begin thanks for the projet, this work easily and permit to integrate a real assets management.
Explanation
For many projet, i use LiipTheme, This is very usefull to provide different interface for a same business case. So as spBower provide a simple tag for assetic : libname_(js|css), it is impossible to have a theme with jquery 1.8 and another with jquery 2.0.
Do you see a work-arround or a good solution.
I created an issue in LiipTheme too, maybe you will communicate to merge yours knowledges.
liip/LiipThemeBundle#98