Agreed...its really simple, and ability to intervene as much or as less as u want. Only thing you are forced to miss out on is the FA bidding, and the draft. Just come up with a system that works when signing FAs. I use random.org a lot! Say there is 5 teams needing a QB...go to random.org, 1-26 means they grab qb via Fa. 26-100, they get one via draft. You do this even if ur one of the teams to be fair. I'd go team by team, adressing needs and how they are met.
When it comes to drafting, you draft based on a combo of team need, and best available. If you feel like pick could be traded to a team to draft a position need you may do it just like it is irl.
Its seriously not difficult, trust me.