I'm trying to set up a gamepad to work with Fuse on Ubuntu. No matter which type of joystick I try to emulate (including None), pressing button #2 (or B in the Sega naming) opens the main SDL menu. Looks like Fuse handles this button directly as even if this button is not mapped to any Fuse key, the menu still opens. It doesn't happen with GTK+.
If I map it to a key or some keyboard-based joystick type (Sinclair or Cursor), then pressing the button first opens the menu and second triggers the emulated key.
I tried two different 10 button joysticks, and both of them behave as above.
Is there a way to disable or re-configure this behavior?