Currently 2 different nudge amounts can be set. These will be the same for moving objects, changing text size, kerning and whatever else. However, for kerning a change of 0.1 or the like is needed vs for an objects you might need 1px or 10px.
Having a different nudge amount for kerning or text properties would be appreciated.
Or another way to solve it would be having 1 more nudge amount value in preferences. That would make a total of 3.