Booking an itinerary. Presently only possible to select a booking class for the entire trip. Change it to allow specific booking classes on a per-segment basis.

Example. I want to fly MAF-SYR, which actually results in MAF-IAH-EWR-SYR or MAF-IAH-CLE-SYR. The MAF-IAH segment is ERJ/CRJ, and same for EWR/CLE-SYR. IAH-EWR/CLE, conversely, I want to book in B class. Unless I book the entire trip in B class, even though there are (Q/K/etc) seats available on the ERJ/CRJ segments, I have to take "luck of the draw" on IAH-EWR/CLE on whether it will offer me B or K or Q or M or whatever.

Please make it so I can do per-segment booking classes.