SeaQuinn,
You have given this some thought and have a good list of pros and cons! Here's the good news....
A former marine refrigeration installer AND another boating friend with refrigeration experience both told us it is much better for the system to leave it running once you have turned it on at the beginning of the season. Turning it on and off places more stress on the components.
A continuously operating refrigerator is also more convenient, time-saving and makes cooking aboard much more fun!
Radeen
Island Spirit, IP-35