Method number 2 would add a significant influx of points to the game. So much so that I think it would be an imbalancer. The repetitious scoring would really generate a lot of points into the game. the first person to get a city with 4 or five segments would be incented to close every other city, even ones with other player's meeples. It would really shift the focus to closing roads and cities in my opinion.
I know that in our games we already do this in order to retain the king/baron. It doesn't shift the focus but does make it something to think about as you are building your own cities/roads.