> but not with binding to modifier-up/down.

I cannot reproduce. I have tested on both Windows and Linux and found I could successfully change to (and use) the modifier-up/down bindings both through the Keys page of the configdialog and by editing the keys def. There was no traceback on either platform. @wyz23x2, can you reproduce this problem?

My personal preference for the new bindings, when tested, was alt-up/down as it is most similar to the existing bindings. Also, control-up/down is used in other apps for moving the cursor multiple lines at a time and shift-up/down (at least in my mind) seems like a weird/random choice. Terry, I don't know what you have in mind, but I think these bindings should be in addition to the existing ones rather than instead of (I also tested this and found it to work correctly).