Trim and nudge can share the same keyboard shortcut in Premiere Pro CC 2015. This tutorial shows how to map trim to the default nudge shortcuts. Premiere Pro CC 2015 performs trim when edit points are selected and performs nudge when clips are selected.
Trim and Nudge keyboard shortcut examples:
Cmd+Left = Trim Backward & Nudge Clip Left 1 Frame
Cmd+Right = Trim Forward & Nudge Clip Right 1 Frame
Shift+Cmd+Left = Trim Backward Many & Nudge Clip Left 5 Frames
Shift+Cmd+Right = Trim Forward Many & Nudge Clip Right 5 Frames