I'm a long time football sim player, and I'm currently playing PFS, which is a very good game in and of itself. These are some suggestions that I have made to the developer about things that PFS does NOT currently have but probably should, so some of these may be in the plan already, so take them for what they are. Enjoy.
1) In Game "Mass Updates" for everything- Age, size, height, weight, contract lengths, etc. Also you should be able to update by position, age, or even team; IE: Every player on the New Orleans Saints gets a +2 to strength or whatever.
2) Player Rotation- You should be able to set players to rotate- IE: I wanna play this D-Lineman on 3rd and long, I wanna play this RB when the starter's energy is at 70%, or I wanna play this OT when we're up by 28 points or more
3) Defensive "Coverages"- You should be able to put your defense in "coverages", not just formations- IE, We're in 4-3, yea, but are we in man to man, cover 2, cover 3, prevent, etc? I have some more ideas about this, but I'll keep em to myself for now.
4) The option to go for 2- We should be able to go for 2 any time we want. Or never. Or anything in between.
5) Onside kicks- Same thing as going for 2. Any time. Never. Sometimes. Whatever.
6) Guided Training- Right now in PFS the training system is so ridiculously random, your offensive linemen have as good a chance to get better at kick accuracy as they do at run blocking. Please have a reasonable training system.
7) Guided blitzes- You should be able to pick who you want blitzing. I *never* want my middle backer with 68 speed blitzing. I *always* want my strong safety with 92 speed blitzing.
Probably a lot more stuff to suggest, but I know nothing of BTS yet, so I'll just rest on that stuff for now
Like I said, these are all things I've suggested to the developer of PFS and have never heard so much as a "Screw you" about them. Maybe he'll do em, maybe he wont, but I'd sure love to play a game that DID have those things.