Thanks Gordon. After a lot more poking around I think I found where you can do that. In the MP dialog if you choose the tab RealTracks, there you can enter a custom range of tempos. I not sure why this feature would be there and not under the Styles tab where one might really want a custom range. Is there a point for having that feature under the RealTracks tab? Is it a bug that it is not under the Styles tab? Thanks for your comments!

Originally Posted by Gordon Scott
If you filter for an exact tempro, BiaB will also give you tempos in the general reion, i.e., it already understands that styles can be stretched or squeezed to fit.