For as tense as the fight over a salary cap has been and will continue to be, Major League Baseball’s players and owners have much to discuss besides the industry’s core economics. Their collective bargaining process rolled forward Wednesday with proposals in other areas that could directly affect the way teams build their rosters.The Major League Baseball Players Association’s proposal focused on revising transactions, particularly those governing how teams can shuttle players between the majors and minors, and what happens to player pay and service time when they are sent down.The players asked for the trade deadline to be moved up a bit, to a window between July 21-27. Currently, the commissioner’s office chooses a date annually between July 28 and Aug. 3. This year’s is Aug. 3.The MLBPA also wants to allow limited trading opportunities after that deadline. The union asked to allow “outrighted” players — players whom teams have removed from their 40-man rosters to send to the minors — to be tradeable once the deadline has passed.The union wants to expand big-league roster sizes to 28 from the present 26 for the first 15 days of every regular season, reducing the workload for players when many are still ramping up for the long haul. That change would also get more players big-league money for a couple weeks, something owners would typically oppose.Other parts of the proposal, which was reviewed by The Athletic, were aimed at reducing roster churn — the rate at which teams go through players. Owners will also be hesitant to reduce those freedoms.