I wouldn't want a best of 3 final, but the more options the better.
Best of 3 finals, enthusiasm always set at a particular number, gameshape always at proficient, no finals (EPL style), more time options, options to have teams in finals (so 8 vs 8) and so options to only play games against the opponents team is available, option to have 2 matches played on the same day so Private leagues run for half the time they normally would, and many other options would be great to have. MVP for private league, all star games for private league etc would really make things more enjoyable.