[Mathias Peter christian]

Had my own problems with it- but found this solution on the adobe forum

1) Set up source patching, right-click the Source Patching “column”> Save Preset. In the Save Preset dialog, select a shortcut from the Keyboard Shortcut control. Click OK.
2) In the Keyboard Shortcuts dialog, find the shortcut(s) that you’ve associated with your preset(s) and assign shortcuts to them.