VLC has an "Off", "On" and "Automatic" setting for deinterlace in the menu. It defaults to "Off" and the option is reset after VLC exits.
I also know that in the settings I can permanently enable deinterlacing by checking the box under Video > Filters. The option then defaults to "On".
Is there a way to permanently set this to "Automatic" on a Mac? (As ZaB points out, such an option apparently exists on other platforms in the simple settings.)