Going through the now-available (HUGE) on-line Service Manual may shed some light on many issues.
For example, it appears that two voltages (one from each cell pair) are read from each module, thus the voltages of all of the 96 2-parallel-cell pairs.
However, it appears that only 4 temperatures are read. So, detection of one module's overheating during charging MIGHT not be as good as it COULD be, if there was a temp. sensor inside each module.
Apparently some "current dumping" (for cell "capacity" equilization) happens for higher-voltage cells, seemingly when the LEAF is turned on. I guess that could help warm some modules.