Custom Shortcut - Unable to set SHIFT + N, where N is an integer.

Custom Shortcut - Unable to set SHIFT + N, where N is an integer from 1-6. 

I’d like to be able to use SHIFT + N to navigate Comp Markers; like in the good old days. 

FWIW, 1-6 are already set up for the 3D Gizmo - so, I was hoping to use the SHIFT + N for navigation purposes. 

So, it seems like the system locks shortcuts SHIFT + N (N=1-6) for navigation even when the user has selected to use 1-6 for 3D Gizmos.

I can get the shortcuts SHIFT + M (M=7-9) to work for navigation purposes. 

This is super-weird wildly awkward to delimit the application’s features in this manner - is there an easy way to workaround this via a PREFs TEXT File? 

TIA