Creating keyboard navigation/ shortcuts for users to navigate

Thank you very much Ashley,

I have found the trigger other settings and managed to use that, unfortunately where there are too many options exceeding a certain number it did not work that well any more. I looked at the 'how the tab key behaves' which you pointed out and how can I use this for someone who can not use the mouse and who depend on the keyboard to navigate. I was wondering whether there is a possibility for me to make use of the tab functionality to allow a user to select a highlighted area like a button or say hotspot to navigate to a different screen/ slide or layer....

I hope it makes sense.  

Many Thanks

Michelle