Real excavator controls are simple enough as is; the main source of difficulty is from performing multiple actions at the same time and the way the real controllers respond. As such I feel that deviating from a real control pattern (rather it be ISO or SAE) would be very much unfavorable.
I do agree that Xbox and maybe PS3 controllers need to be supported, look at the way the tenstar digger demo handles it Tenstar-digger-demo.software.informer.com
Bulldozer controls should be fairly simple with a gamepad, triggers for steering (Would need to support a single axis), left stick for throttle/gear changes, right stick for blade controls. If graders are added they would be a source of more complexity and would probably need a simplified control scheme for gamepads, sticks with twist functionality would work fine as proven in real equipment by Cat's M series.
Lord_Vadermort
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