When you are going to create a branch you must provide a name. It would be nice if the textfield alongside the Label "New Branch:" could provide some kind of autocompletion regarding namespaces/branch names.

The workflow could be oriented towards Linux. E.g. I type "fea" -> hit tab key autocompletition to "feature/", than I append "c" -> hit tab, autocompletion to feature/customer and so on. The chooseable possibilities could be provided via a combobox.