I have purchased a "Mack Pack" lazy jack
/sailbag combination which is now being installed. There are a couple of boats in my marina with the system and I decided to go that route after speaking to happy owners.
It looks like the Mack Pack system can be completely moved out of the way if you wish, so other than a minor amount of hassle, you should be able to get full performance from your main. The effort required to lower the jacks and stow them should be minimal compared to wrestling a full batten main to flake and tie.
For short sails, you can leave the bag up and perhaps sacrifice a bit of performance, in order to have the convenience to drop the sail, tuck, zip and be on to the Pain Killers that much faster.
I'll be posting about my experince after I've had some time to evaluate the systems for a while.
PS edited to add the the Mack Pack is open at the bottom along the boom so water should drain and air can circulate so there should be no issue there.