I think that adding the option to use multiple Google calendars would be very useful, especially for us using the One Man Army package.

For instance, I have my personal Google calendar and my business Google calendar and they are synced with each other with full access. However, when adding the Google calendar in RepairShopr, it asks me to choose one of the two calendars. If I were able to choose both, then my embedded calendar could also show when I am unavailable due to personal appointments. With just the business calendar showing, people can choose times that I may be unavailable due to doctor's appointments or other personal reasons that are scheduled. This would allow those times to be blocked out as well.

Seeing this option to choose between the two when adding, I would think it should be easy to implement.