However, you can easily quickly carb without over carbing by simply set it at the desired pressure (12psi for example) and then rolling the keg back and forth for 10-15 minutes or whatever works. That way, it's doing the same thing without the possibility of over carbonation. Just make sure it sits for a few hours to let everything settle inside the keg. I did this method the night before thanksgiving for my pumpkin. Set at 12, rocked it for 15-20 minutes, let it sit over night, tested in the morning and poured a perfect carbonated pint. AWESOME!
With that said, if you have time, the set and forget method is probably the best though. Lots of ways to get to the same place.
Keg #1: Empty :(
Keg #2: Empty :(
Kegs 3-5: Empty :(
Ferment #1: Empty :(
Ferment #2: Empty :(
Ferment #3: Empty :(
On Deck: Something....Anything!!!