Fromeco states that the badger failsafe switch's current draw isn't enough to warrant unplugging a battery. From their knowledge base:
If you get the Fromeco switched regulators they draw 3mA... will drain a full 2400 in 1 month.
That being said, I don't unplug mine... I do watch them closely and I charge the night before I fly.
As for drawing the batts down evenly... the Fromeco regs are adjustable. Just set them up to be within .01V of each other and you won't have any issue with the packs drawing down evenly... at least I don't.