I'm testing the trackball in the game from retrobat.
The emulator that supports multimouse is not implemented directly with retrobat. But from the advanced menu of the game (by holding down the b button on the tehkan game), we can choose the MAME64 emulator, which will be installed next.

Once installed, again in advanced options. We have to activate the multimouse

CONTROLS

- CONTROLLER PROFILE : GAME SPECIFIC

- MULTI-MOUSE: YES

- TRACKBALL DEVIDE: MOUSE