I am new, but I will put in my 2 cents:
The DH -> no, I am old school on this one.
Interleague play -> I like the idea of playing every team as long as the schedule is even. I think we'd hear complaints if we play some teams and not others.
League expansion (earliest 2016 season) -> I agree with the poster who said we need a solid group of owners before expanding...
Enable international/amateur free agents -> I like free agency, but have not been around long enough to really have an opinion here.
League schedule / number of games -> Again not much of an opinion here. I like 154 or 162 games - if we go to inter league play we'll need to devise a good plan to stay close to a 162 game schedule...