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You can change your mouse button preferences. I know alt-RMB and alt-LMB do different things in regard to the lights and cameras. Left mouse button will orbit the object, where Right mouse button will rotate in place. In regards to orbiting around an object. There is an option in preferences near the trackball to orbit around selection.
Not near Modo at the moment. But I did find this little tidbit: while hovering the cursor over some geometry and hitting 'g' centers the pivot point. The viewport rotates with that geometry as the centerpoint.
To rotate around all the geometry press 'a'. This will fit the object to the viewport and centers the viewport pivot to it.
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