Maybe this helps:
To create a shortcut
1. right click on main toolbar (just underneath menu bar)
2. click on "Customize..."
3. in the tab "Commands" (normally allready open), click on the tab "NEW" at the bottom
4. in the 'Action' plane after "Process", click "Browse" and find and select anything usable
5. in the 'Action' plane after "Parameters" click on the dropdown and select anything usable
6. in the 'Shortcuts' plane, click in the region after 'Primary', and type the key, or combination you want to as shortcut
Done!!