Playoffs? You're talking about playoffs?
Here's an example of why this is not a good idea. Imagine Teams A, B, C, all in La Coupe Hauxer. Team A finished the regular season with a 2 game lead in the standings ovber Team B. They play a non-LCH team in the first round, while Team B and C play in the first round. Team B wins their series in five games. Team A wins in four. In the second round, both Team A and B play non-LCH teams. Team A again wins in four, but Team B loses in seven. Team A goes on to win the Stanley Cup.
Now according to the ideas about adding the playoffs to the standings, Team B just overcame a 2-game deficit and won LCH by one game. Team B was given an extra chance to do what they could not do in the regular season, yet Team A was never given the opportunity to counter that. Now do you think Team B should win La Coupe Hauxer? Because I don't, and if I was Team A in that scenario, I would seriously consider leaving LHC after that.
That being said, I'm not opposed to using the playoffs to break a tie, like a shootout. The only consider if that both teams need the opportunity to affect the standings ON THE ICE.