Yes, it can!!
I modified the main.cpp to load the toolbar from an .xrc.
There's a caveat: The image files have to be in the SAME ZIP FILE than the .xrc. It's a filesystem limitation. (However, the images can go in a subdirectory *INSIDE* the zip.
I still have to check how to use this to merge the xrc toolbar with the plugins toolbars. I hope a toolbar can have OTHER toolbars inside, it'd make my job much easier (I'd use a master toolbar, then insert the main and plugins toolbars inside it).
I'd add a screenshot, but don't know how ^^;;