Also, do you need mouse control within Daphne? I mean, to play the games? I thought they were all joystick controlled...
At the risk of hijacking this thread even further...
In my original CP setup, I was wiring my USB trackball mouse buttons to P1 buttons 1 and 2. This worked fine for MAME but not Daphne. I had to rewire the mouse buttons over to P1 buttons 5 and 6 instead.
I've got Daphne set up to use my P1 buttons 1 and 2 which are currently wired to my U360 through the optional wire harness that Andy sells.
Using the Daphne configuration options, I didn't have any trouble getting it to recognize the U360 button presses.
If you can't get it to work, PM me and I can take a closer look at my Daphne setup when I get home later.