You can do that through scripting. Basically you create the script, then you assign a key to the command. The script is very simple:
SetUserPref "3D_TRANSFO_REFERENTIAL_CHANGED",
where is one of the following numbers:
1 -> Global
2 -> Local
3 -> Ref
4 -> View
6 -> Parent
7 -> Plane
Hope this helps
Salutations - Cheers
Bernard Lebel