Feature Request for ISBoxer on Key Combinations

A way to assign unused keycombos within ISBoxer, rather than having to try and figure out what I assign where, when I have every class within WoW and each one having dual specs which I do swap up a lot so my macros change, and having a total of 20+ macros, plus all the action stuff and all that needing key combinations assigned it gets hard to remember what ones I haven't used

So maybe a feature within ISboxer that may be optional to turn on? I would be happy to test it out if this was implemented.