To add more content control pairs, all you need do is run the AddControls macro - you don't need yet another macro to run that!!!
As for assigning a shortcut to the macro, see the first link in post #3 in this thread . However, I would recommend against trying to assign any pre-assigned Word shortcut keys, such as F8. Doing so can have unpredictable and undesirable effects.
To see what the pre-assigned Word shortcut keys are, visit:
https://support.office.com/en-us/art...2-f762f663ceb2