The Transition window leaves a lot of room to show a list of transitions, but very little room below to make adjustments to a particular transition. With only 1080 vertical pixels available to me, this makes for a good deal of scrolling around to find the various adjustments. How about taking some space away from the listed transitions in favor of allowing more space below the list for changing transition parameters?
BTW, thank you so much for Shotcut. I tried a lot of editors for linux, and Shotcut is the best of the bunch.