if you're using Mame32, I believe Mame.61 or later will have that option....
but Mame32 .58 does not....
there is a startup option... and you can use the joystick (gamepad hack) to control the movements....
1st button is play game....
2nd and 5th button is like next "letter" down...
3rd and 6th button is the top and bottom....
although still not as efficient as a mouse... but using the panel... you can select to the game you want at somewhat reasonable speed.....

hope it helps....