A)
I can ABSOLUTELY confirm it's not done by alphabetical order. In the OS Online Franchise, both Houston and Tennessee finished 8-8, leading the AFC South, but the Texans beat the Titans both times, thus winning the tiebreaker. However, when we advanced to the playoffs, it was the Titans who got the division title and the playoff birth.
B)
Get in touch with Ryan Ferwerda at EA Tiburon. He and another Online Franchise engineer were able to fix our playoff seedings prior to us beginning the postseason. They also fixed our draft order for us, upon request. All you have to do is ask, you may be surprised what people are willing to do to help out.