How Football Playoffs Should be Improved

I'm not big fan of playoffs to decide promotion.  Four teams who have played at a certain level all season have to play each other over the course of three games to hope that they win.

If they're going to stay, then I think they can be improved upon, at the very least to make them fairer.  By this I mean that the team who finished higher should have some kind of advantage or benefit for doing so.  

Teams finish in this placement (behind promoted teams) :-

A - 85pts

B - 80pts

C - 79pts

D - 76pts

Instead of having team A play D and B play C over two matches, why have team D play one match at team C's ground.  The winner goes to team B's ground.  The winner of that plays the final at team A's ground.  Team A has a single game to play, at their own ground.

To add more of an advantage, perhaps the number of points a team has over their opponents during the regular season could be converted to a number of goals start.  Better still, the team gets that many penalties at the start of the game which would add a certain edge to the game.

So if team A plays team B, they would get 5 penalties at the start of the match.  This has the potential to give a team an unassailable lead, but they've earned that over the season.  Image a game with just two penalties at the start where both are saved - surely a real event to fire up the crowd.