I would also very much like to +1 this, if this still isn't feasible, the ability to create global swatches by default. It's absolutely critical to the design of the information and organization of a file. Especially for anything productive.
Found this thread because I'm trying to make a set of globals from a document and finding that I have to select each and "set Global mode" manually, which is painful. Checking the unofficial PDF manual, I didn't see an easier method than this, sadly.