Assigning Hotkeys

To assign a hotkey to toggle the panel on and off you can use Assign Hotkeys... option in flyout menu. Simply select the Toggle Modificator hotkey button and assign a hotkey. Using this window you can assing any keys that Photoshop allows;

In conjuction with a Close on Click option enabled, the panel can be hidden most of the times, called when needed and then automatically closed after an adjustment has been made.