You can add hotkeys of your choice in Screen4, just make sure you choose something thats not already been used. Also be careful as the Jog keys may not work exactly as expected, it may start jogging and need an additional press to stop.
One last thing is that to use HotKeys you need the button to actually be on the page you are viewing so you will either need screen 50 open or you will need to add the buttons top the pages yopu wish to be able to jog from.
Hood