As culturedleftfoot says editing the league table can be risky after the season is over....from my experience once a team has been relegated, or qualifies for playoffs or gets promoted it becomes "hard coded" so even if you change the league position and modify the number of points if a team has an "R" next to them in the league table they're still getting relegated no matter what you do!
I've had incidents where i've literally shut down english football by modifying a league table after teams were hard coded as relegated. for example instead of 3 teams going down 4 went down and it basically killed two divisions.....whats strange is the rest of the football pyramid contineud as normal but the following season another league division was killed off and this continued until all the football league shut down. This included the FA cup etc...
So yep be very careful about modifying league tables and then you do it!
Personally I enjoy giving teams a -50 points figure at the start of the season and that usually sees them down without any problems!