I wouldn't expect K-Mod to put any more stress on your CPU than standard BtS. Also, if your computer is crashing due to overheating, that's a problem with the computer rather than with the game. (No program should be able to crash your computer like that. The operating system and the hardware itself are responsible for protecting against overheating.)
However, I do know that my laptop gets quite hot when I'm playing, and I've been wondering what I can do to reduce the load. But I'm pretty sure that the bulk of the heat-making is happening in the game's .exe rather than in the dll, and so I don't think I can do anything about it. But maybe I should test it without K-Mod at some point. I'd be very interested if K-Mod does actually run hotter. It would be surprising, but potentially very useful information.