Question about map keybinding

[ribcabin]

I have a question about the map keybinding. I know the default is to "toggle" the map, but is there any way to easily get a momentary behavior where holding down tab shows the map, and releasing tab closes the map? maybe an option I'm not seeing, or a console command? Seems like a basic thing but I can't find any kind of discussion on it or anything because the terminology is so general.