Not sure about the word high importance but only incident I have found so far in a football is, a referee Brian Savill intentionally scored for a team losing 18-1 which final result was 20-2.
As the ball came off a player's head, he volleyed it into the back of the net.
Another incident of referee scoring goal is from Turkey 1986 for Ankaragucu against Besiktas resulting in A.Gücü 1-0 BJK.
Not a goal but assist in UEFA Cup 1995/1996 Bordeaux vs. AC Milan, Video
There hasn't been much goal from referee and it may have something to do with positioning of referee also. The video you linked shows referee staying in post for corner but now the referee don't stay near the post for corner. Source
