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I wonder if those angles cause it to leak, spill, or otherwise consume oil it wouldn't under normal operating conditions.

I don't think the angles would have an effect on how it's consumed. It should be all sealed. Maybe driving habits or typical use affects how the oil gets used up. I'm not sure. I also don't know why mine was dirtier than others.

Regarding a supercharger for the 3.0, there's a couple threads on the older Toyota forum here, such as this one or this one.

Jeff
2000 4Runner SR5, supercharger, rear e-locker, ARB front locker, 285/75R16 MT/R's, custom bumpers & skids
2007 Tacoma double cab 4x4 - stock