In Premiere Pro, is it possible to link the "Create new black video" function to a quick key?
Hotkeys inside premiere are only available if they appear in the shortcut-list. However, you might be able to use an external program such as macro recorder to bind certain actions to a custom button / button-combination.
(i do not own macro-recorder btw and have not tried it for myself. I only heard that it works well with premiere.)