You can use ctrl+m to rotate with more accuracy but from what I hear you only want to really rotate at incriments of 15 degrees.
As for which axis, you can rotate an object on all the of them (x,y,z); you just can't rotate an object for a specific point, I'm fairly certain you can only rotate it from the center.
I think you were wondering more so if you could rotate an object from a certain point, but if you're wondering how to rotate on a different access just rotate it in a different view or use ctrl+m.
1. Yes you can, but more in a roundabout fashion. A convenient way I picked up to do this (nicked from Dave Johnston's very-useful-but-now-defunct blog) is to use brushes to shift the origin and then rotate the brushes. It's more fiddly than using a proper pivot function and possibly not what you're looking for, but it's worth a look nonetheless. http://blog.johnsto.co.uk/?action=view&id=94
2. Hold shift when rotating.
to rotate in smaller than 15° you need to hold shift while rotating
e: damn you defrag
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