A suggestion for a work around on this is to rename your zones with a reference to the master zone. Example, name your zones something like:
1-Front yard
1-Front flowers
1-Side yard
2-Back yard
2-Back flowers
That way when you want to turn on the front flowers, you (and your wife) will know it's master 1 or 2.
This might be a work around to get you by until the feature is added (if it is).