We have over 2,000 banned users, most of them being spam and inactive after the forum conversion. Therefore the bulk of the bans are permanent bans (i.e. bans without end date). The moderators mainly use temporary bans (the bans with an end date), but due to the large ban list it's impossible to find those temporary bans. So we have no clue how many temporary bans there are.
It would be nice to have a "temporary/permanent" filter in admin.php?banning/users, something like this: