If your plugin doesn't already do this, it should. I know I would be happy to see the mess of JS includes in a WordPress page amalgamated into one.
You would probably have to have the plugin be assigned to the different Templates in the Theme. The it would load them once, gather the JS result and then do what JS Builder does (too bad Google's version is an .exe).
Let me know if you are doing this, or are going to do this. If not, I may do it