Feature Request: Conditional Squash Merge when PR only contains one commit

[jimjaeger]

Feature Request: Could you add a function that bulldozer use squash merge function when a PR only contains one commit.
In a PR with many commits a merge commit usually does make sense. But in case of a PR with only one commit usually a squash merge makes more sense. Is there any chance to be able to enable that a different merge type is used based on commit count?