[otrs] confused by column filters

Hi all, I am slightly confused by the behaviour of some column filters in the TickerOverviewSmall outputs. By default, all column filters throw an AJAX request to get the list of possible values of the column between those of the tickets listed. But then Owner and Customer filter aparently ignore this list and show instead a user search. - What's the purpose of this behaviour? - Is there any config option to use the returned list and avoid this user search? Kind regards, Juan Clavero