Need more elaboration on that, there were some suggestions about an extra feature on setting the lineup page like giving your coach orders as for how many minutes you'd want your players to get, which is somehow to control substitutions a bit more.
A lot of things could be done in this regard, but I don't think they would fall under the "minor suggestions" category.
For instance, there could be an option to tell the coach to not substitute a player for any reason whatsoever except for injury, which would allow to train 48 minutes while fielding more than 9 players.
Or have two players play one quarter each at a certain position, etc. etc.
I guess that these suggestions would fall under the more control/less control discussion, but they would definitely be major changes.