So in your case 1, the existing current/temperature monitoring should take care of any destructive conditions.
Case 2, you might not see maximum current, but equally you possibly won't see a huge temperature rise, just an increase in speed without motor control - I think that's taken care of in software somewhere.
Case 3 - slow temperature rise, the existing temperature sensor should pick it up...
In short, I think the bases are pretty well covered.
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