Yes, any dried spice/herb/coffee bean can be ground in this device.

No, the operator can only achieve these differences by timing the grinding correctly.

Use a paint brush (about 1/2 inch wide) to brush out the ground coffee, then use a damp paper towel to clean up the fine powder. This method works very well, especially if you use a soft brush. Keep the brush near the grinder and brush out the grinder after each use.