Yes, I know you weren't using the name Doe, just threw that in there for anyone reading who thought that might be an option.
"Jane Brown formerly Doe" is what is seen when looking at the profile, but will not show up that way in a search. As you have seen, though, both names will still direct anyone looking for that particular person to the correct profile for instances when they only know one name or the other(s). As for preferences and "the future," I think WikiTree has given as many name fields as possible for all the possible surnames one person can have throughout their life. In any event, the ID number is based on the birth surname. Not going to worry about the future, as I'm just trying to handle records from the past. :-D