I found a solution last night that I am pretty amped about.
(I have a PS3, and still playing on Madden 12)
I used this editor:
http://www.operationsports.com/forum...editor-v1.html
And this roster:
http://www.operationsports.com/forum...ft-roster.html
You can open up the roster on your computer, and you can go through and create (I think) nearly everyone from the draft. It will be time consuming, but so far this is the best thing I've come across for doing it on your own. I plan on doing this when I get home today. I don't know exactly how many I'll create, but at least the 1st and 2nd rounders and/or positions that are needed per team (so some late rounders if I can).
This is just as good or better than what was posted in this thread, as everything-appearance, traits, ratings, ect.. is within that roster file. You can obviously change what you want. Might have to look up some jersey numbers, but that's all I'm anticipating.
I am doing this purely to be able to play offline multiplayer with friends with an updated roster for the offseason. I do not know if you can take the roster into franchise, as I am sure there will be a ton of discrepancies between contracts and team sizes and CAP. It may take me awhile since I am doing this on my own, but if I get to the point, I can upload my changed roster after I get finished with it-I wouldn't expect it for at least a couple weeks since creating players is incredibly time consuming, let alone the depth chart changes.
I have been using Schoene503's roster that was uploaded at the end of last season and making my changes off of that. Like I said, its Madden 12 and PS3, so if its something you might be interested in the future, shoot me a PM and I will make a thread later if there's enough interest. Figure I would offer for all of those like me who are still playing Madden 12, but want the changes. I'm willing to put in the work, I like doing this sort of thing-just realize it takes time.
Hope this helps some of you in your search.