I totally agree that the scoring for this league is screwed up. First basemen/Catchers become way more valuable comparatively. That being said, this league has existed for a while, and I have personally made a lot of moves based on the scoring system as is. For instance, I would not have traded for Ike Davis and John Jaso or pushed to sign James Loney and Carlos Ruiz last year. So, changing the rules would hurt my team as it is set up pretty significantly.
That being said, while I do not want the scoring to change, I like the changes to the offense. I disagree that fielding shouldn't be incorporated though. The previous system was obviously flawed, but fielding is a huge part of evaluating players- I would suggest trying to incorporate fielding in a point system the way that WAR tries to use it. There are fantasy leagues that use a point system like that. Also, I think that the previous point system for pitching was not bad for our league. It may have overvalued closers/set-up men compared to real-life value, but it seemed fair when you compared player's performance.