Currently KConfig has Shift+Del as alternative shortcut for Cut action, however apps that deal with files usually use Shift+Del as "Remove file from disk" (as opposed to plain Delete doing "Move to trash"). This then results in broken functionality in some apps using KStandardShortcut::Cut as pressing Shift+Del to delete a file opens a dialog saying "This shortcut is ambigous, change it in settings". Given that Shift+Del was the default for "Remove file from disk" throughout kde4 times, I think that it should remain available for this action rather than alternative shortcut for cut action.
To keep things consistent, the alternative shortcuts for copy and paste should also be removed in that case - the three form a suite. I've never encountered anyone using these shortcuts, don't know how popular they are... would guess that they're not very popular. Can try to remove them and see it there's an outcry... :) On the other hand, most applications use cut, copy and paste actions but most applications are not general file managers. Those few filemanagers could also make a special case and not use the default shortcut for cut if it is shift+del. Anyway, the conflict should definitely be resolved.
This was recently fixed for Gwenview, see bug 377880. Are there other applications that need a similar fix?
Can we just remove the Shift-Delete shortcut for Cut actions? This seems like a really weird, obscure shortcut for an action that already has a universally-known shortcut (ctrl-x). Then we won't need to add any application-specific workarounds.
*** This bug has been marked as a duplicate of bug 394001 ***