Fine tune access control in SVN repositories

It would be nice to be able to use the UI to grant access to just a subset of the SVN repository. For example, in the Repositories module there could be a button to edit access paths for each repository, where the user could add/remove pathnames to a list, such as /trunk/foo/bar or /branches/BranchName. This would add new sections to etc/svn-access.conf like [[ReposName:/trunk/foo/bar]] and [[ReposName:/branches/BranchName]]. Then all of the defined repositories and access paths can be shown and selected in the edit user module like the repositories are selected today.