You cannot use a mouse to control games that originally had digital joysticks; this is because it would be a god-awful experience and your wrists would fall off. Games like Gorf used digital joysticks: they're either in the center or up/left/down/right, never anyplace in between. Mice, especially modern ones, are analog and have tens of thousands of points in between. The two systems don't translate well, and MAME doesn't even try.
Your best bet is to buy and use a USB game pad; many people who also own consoles have found happiness using Xbox 360 or PlayStation 3 or 4 controllers, but there are PC/Mac-specific ones as well.
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