Yep, both of these are not new developments..Sims have always adjusted at the half and will play players out of position if there's a significant skill advantage to the out of position guy. Sims also change offense and defense in the offseason occasionally to whatever sets the individual player Off/Def grades average out the best to, so if you have a large graduating superclass, you'll sometimes see the Sim change O/D in the offseason, leaving its returning players to hang.