Grey, we have a 12 team h2h format and count OBP, SLG, runs, rbi, sb and errors while the pitching categories are era, whip, wins, strikeouts and saves. We don't have to keep 8 players if we don't want to.
Youngid, I did try moving some of my outfielders at the end of last season, but I couldn't even get any offers let alone a decent one. My league has a pretty large jackpot and the playoff winner picks the auction location (12 people in 9 different cities from Sand Diego to NYC) so everyone is engaged, but there are usually only a handful of trades a year. I'm not sure why my league mates don't like to trade and making them in this league is usually a headache, but I should make another attempt though.
I agree with Youngid. The OFs are your best bet. I'd try to trade some of them again, if you can't make it happen. If you use 5 OFs and not three or four, I'd hold Pence, Hart and Maine. Let Ethier go back into the pool. If you use 3 OFs and a UT, I'd hold Hart and Maine and let Pence go.