Today I tried this plugin and I would love to see one addiiton.
We have mutliple repositories to checkout in one job and therefor I can't use ${sourceBranch} as the commit id seems to be in there.
Would it be possible to add ${sourceBranchName}/${targetBranchName} where the name of the branch is used instead of the commit id?

Then I could use this for all repositories to checkout. We use alternative checkout method here. So if the branch X is not existing it falls back to master.