No need. It just adds weight. I never charge lipo's in the plane. If I want to check voltage then I just unplug the battery and check it directly. I always remove the charge cable, so it would be nice to have just a switch and a regulator.

Acutally, after thinking about this I decided to make an ammendment. If you are a glow flier you might want to keep the charge cable to check battery voltage. They don't normally have to pop their planes open during the day so they'd probably like to keep the charge cable. I am an electric flier so I could do without the charge cable.