Move clips up and down shortcut mapping is missing.

Does anybody know how to map a |editMoveClipsUp ?
The default shortcut is Alt + Up/Down Arrow on PC but I find it to map keyboard customization panel?
Is this some bug or its not possible to remap this?
The default shortcut is Alt + Up/Down Arrow on PC but I find it to map keyboard customization panel?
Is this some bug or its not possible to remap this?