Commits that possibly violate the atomicity rule

[mylk]

Often, such commits contain commas, periods.
It may be risky, but the "and" and "also" keywords can be tested too.

[dbaltas]

Great!
I agree that it will be difficult to get accurate results, but we can start with a naive algorithm and then build on it. On this or another issue we could have a percentage of Commit Message quality.
This article is a good starting point.