TrakPower endorses moderate warming as an acceptable practice. Ling provided some test data a while back that showed no ill-effects on cycle life when kept to a reasonable temperature. I think the IIC guys got it right with 110. Just be mindful of the temps if you're waring inside a Liposack, because they hold in a lot more heat.
If you want to be worried about something, how about guys removing the voltage clips from their GFX's to always charge to 8.44? That scares me more than a little heat.