In BB project/Settings "Default merge strategy": no option to have both --squash and --ff-only

[kczarnow]

Is it possible to configure

git merge --squash --ff-only

as default pull request merge strategy for a project? I can only see "Merge commit", "Squash" and "Fast forward" available in the dropdown. Somehow combining the two makes sense to me...

Thanks!

Krzysztof