Filter out only selected branches, not only all or current one

[DaDlugosch]

Currently, there's only a feature to filter out current branch or display all branches with their commits. I'm struggling with finding the branch I want to cherry-pick from, it is even not possible to search for a branch name in a search field as it only searches through commits or authors and etc. except branches.
It would be wonderful to have a feature to list only selected branches, AND/OR add support for searching also by a branch name.