Add button for user access denied

[anonymous]

Currently there are buttons for read and write flag, but sometimes you want to deny the access for given person on specific pathes. Example:

[/som/path/in/svn]
john = rw
admin = r

[/som/path/in/svn/subpath]
john =
admin = rw

john has read/write permissions for path /som/path/in/svn but he has no access to path /som/path/in/svn/subpath.