I have an ultrawide 3440x1440 monitor attached to my MacBook Pro so the snap to left/top/right behaviour available on the General tab (of BST 1.9.8) isn't ideal, as a fullscreen window (drag to top) is absolutely huge and even a half-screen window (drag to left or right) is still a bit big.
What I'd prefer is for drag-to-top to give me a full height window that's 1/3 the width of the screen, with the position being determined by whether I drag to the left, middle or right third of the screen top.
Yes, I know I can configure a right-click on the R/G/B buttons to position the window in this way (I already have) but I'd find a drag more intuitive. I could probably do it with Customer Snap Areas too, but again that's too much hassle.
A colleague has a super ultrawide monitor (3840x1440) which is basically 2 "normal" monitors wide. For this I think a drag-to-top making the windows 1/4 the screen width would be better, so maybe you could make the behaviour configurable.