A TMS might have a limited effect. Tesla gets away with it because they have a large pack and can give up some energy to keep the pack cool when not plugged in without using a large portion of range. The Volt has a generator so range loss is not an issue. Do that with the LEAF pack and you might take a significant range hit trying to keep the pack cool during the day. I do think there would be a benefit to cooling the pack down at night when charging. Plus allowing preheating the pack in cold climates. Maybe for the LEAF the TMS would be active only when plugged in.