Offense works fine, here's what you do.
Pick a playbook and clear all the plays but the one play action. Once it's clean except for that one play, add your 5 audibles like this.
1. Pick play, rate it 5 stars on 1st down only.
2. Pick play, rate it 5 stars on 1st down only.
3. pick play, rate it 5 stars on 1st down only.
4. pick play, rate it 5 stars on 1st down only.
5. pick play, rate it 5 stars on 1st down only.
Now, go into your gameplan, hit edit game plan, then copy/paste your 1st down plan to all your scenarios (paste).
Save the playbook. That will give you those 5 audibles.
Defense I haven't figured out yet how to have special teams options. I clear the playbook and lose onside kick, field goal, etc.