Please add the capability to enable or disable pull request branch delete on merge. Ideally there should be a setting at the project level if the "Delete source branch" is automatically set or not. The ability to set this at a user level would also be helpful.
The current implementation automatically sets "Delete source branch". The selection is remembered for the user for the specific repository. However, some projects could have multiple repositories and the user needs to remember to uncheck for all of them individually