We also use Concur at work but also use swabiz (Southwest Business) since WN is not shown on Concur. I doubt F9 is big enough though to make it past corporate travel departments but they could at least look at the WN model and create a business web site.
I do not use Concur for F9 for a while already since I had too many issues with not getting stretch seats and then having to call in all the time. But this only works because I am high enough up the food chain to get away with it and do have a company credit card that I can use for it.
One of the unintended consequences with this move is that F9 will loose business travelers. The F9 miles are already worth less then the major carriers and on top if it I do get less miles (I get double on UA and AA rather then 50% bonus) and if this would be cut now again in 1/2 this would be bad news.