Well, not official - but I don't see your point. You can keep as many rigs as you like - but there's a limit of 1000 rigs that can be stored in the KPA. So if store 200.000 on your hard drive / usb whatever device that's fine. You can have various USB drives ready. However, not more than 1000 in your KPA at the same time. When I think about it: let's say an amp has about 5 sweet settings - that would mean you have a control over 200 guitar amps with 5 different settings each. Or a different example: If you are looking for a specific sound and you take 2 minutes to test each rig that would mean you will have to spend 2000 minutes to go through all the rigs you have in your KPA. ... Takes 33 hours to go through all of the 1000 rigs. I guess, for most situations it might even be a better idea if the KPA had a restriction of a maximum of 50 rigs. The more choices you have the harder it is to make a choice and making a choice is what a musician has to do all the time.
I totally see his point. He's not only a player but also a producer/engineer. He needs to call up sounds as fast as possible for a given context and to a particular client's taste.. Totally loading a new set of rigs off a usb sticks is wholly inefficient and a time waste. A computer Librarian over usb would solve all this.