The reason behind using a backup to cover more than one position is to stop SIM from rotating in your whole bench, I have literally seen 3 rookies, Rodman & Rondo put on the floor together with Rodman at PG.
Yeah, sub logic can be absolutely terrible at times. However...
So, is there another way to keep this from happening and force a rotation that a sane coach would use?
You have to have a very flexible bench... almost every player on any bench I make is 100% effective at multiple positions. Also, I try to match usage tiers as much as possible. If I have a 2nd tier usage SF starting (91 Barkley, for example), I'll try and make sure his back up is also 2nd tier usage (11 Carmelo's 977 minute season, for example). Sometimes I can't make them all have the same stats, but I can get close on most of them.
Also, if you have a player that played 35 mins per game for 25 games and sit them down and use them for 35mins per game in the last 25 game isn't this replicating their real season stats.
You would think so, but no, it doesn't work like that. It's based on real stats as if they had played 82 games. I tried this in a prog league once with 85-86 Michael Jordan.. every time I tried to play him even just 20 minutes a game, he shot 30% from the field and turned the ball over like it was his job. His 12 game average was... terrible. It's set up that way to keep people from abusing the players in the playoffs.
$55-57 the minutes are different. At the higher salery caps I bring full season backups and only use a portion of their mins.
You're actually better served not spending money on extra minutes. In a league where you don't get rookies, you don't want more than 20k minutes. 19,200 is perfect if you don't have any overtime. You can do less if you don't mind a little fatigue (which IS okay). I recently won a $55M league running 09-10 Lebron, 89-90 Jordan, 91-92 Rodman, 02-03 Big Ben, 66-67 Wilt. I made the most out of what resources were available to me... something I talk about extensively in that new thread I made.
Let's actually break that line-up down a bit.
Lebron - really helped in all 3 facets (possession, shooting, fouls)
Jordan - same - all 3 facets
Rodman - really helped in 1 (possession), moderately helped in shooting (good defense, good efg% but low usg so that efg% wasn't that helpful)
Wallace - same as Worm; big help on possession, morderate on shooting (lower efg% but lowest usg% on team). Also really low on fouls committed.
Wilt - helped in all 3 facets.
I had a smidge more usage than I needed (19 points total), but I actually milked out all of their RL possessions b/c of the way I did my rotation.