[EXCEL] Assign Keyboard Shortcut

Is it possible to assign keyboard shortcuts to actions that don't currently have any?
e.g. Comment/Uncomment Block

MZTools looks like it is doing it, but I wonder if it has its own Comment/Uncomment Block commands and is assigning to those instead of the built in ones.

Besides which, I want to assign to Ctrl+/ and that isn't an option from MZTools

you should be able to add a short cut to the excel command button object that do this, but would need one to comment, one to uncomment