I just think that tinkering with the draft is a dangerous slope. I think we can agree that a cap on prospect payroll would effectively end the monopolization of the IFA market, I believe that should be set at $25M. That leaves enough room for 1-2 big time IFA signings an enough over to sign all of your draft picks, assuming they go conservative and sign slot guys (and if you are rebuilding, there is no reason to pursue anyone but slot guys).
As for the draft problem, it is a simple fix, give the commish the ability to remove any owner who is deemed tanking. The only problem I see from this is commissioners abusing the privilege/getting power hungry and removing someone who is rebuilding, but is mistaken for tanking. All in all, I am inclined to believe that commissioners would be the righteous ones and not abuse their power to remove anyone without a discussion with the unruly owner first, but that me just be wishful thinking.