Thanks all above for the help. I was able to clear that in the mame2003 core, but for some reason, mame 2010 was not as cooperative. It automatically binds the mame menus to the L3/R3 thumbstick buttons and can't be cleared (I tried using the same method as mame 2003, but to no avail). But I came up with an easier work around for both. I simply unbound my l2/r2 and l3/r3 buttons from my controllers themselves. I find there is no real need for any of these to be used for classic gaming, as all you really need are the shoulder and face buttons. So that uncomplicated things, and the menus are now no longer accessible. Easy peazy.
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