PC to PS3 USB cable for sending inputs?

I’ve done a quick scan through this forum but come up with nothing that appears relevant.

I’m interested in programmable sticks etc. but wondered if now that the PS3 uses USB for inputs if it would be possible to send signals from the PC to the PS3 via a USB to USB cable. I know very little about electronics and programming, and given that no-one has created this yet would assume that there’s a reason that it’s not as simple as it appears (to the ignorant). But I would be curious to know why that’s the case, and if anyone has attempted to build something like this?

Trying to use a simple USB A-to-A cable won’t work; USB is strictly a one host protocol.