I rarely use nudge (I do everything like that by hand/with snap).
My point is Nudge does a ton of different things. It is context sensitive. It's kind of like wanting to expose and change all the things the Smart Tool does. People have actually asked for that but it just does too many things to make it feasible to allow such specific access to.
If you can change the Nudge bindings the action would likely change ALL the nudge actions. You are focusing on only one thing that nudge does. Even then you are ignoring the other nudge buttons that (I think... and I assume we are talking about MIDI notes) moves notes up a semitone at a time or left and right in increments.
Nudge is very complex and has it's own little set of Preferences that can be twiddled with by the user.