In any 3D axon or perspective view, editing the section box is a bit blind - how can I tell where along my building the section box face I'm editing is going to land? Yes, I know one answer is, "go to an elevation or plan view and adjust the box to land where I want." But I don't want to have to switch from one view to another. I'm lazy like that. Instead:
1_ in the 3D view, show some sort of a live view of where all of the various objects are going to be cut as I'm moving a face around. sort of like when you see an object getting laser scanned, y'know?
2_ allow Align to work with this feature - I'd love to be able to Align-to-Center of a window and slice that bad boy right where I always want it. You know you want it too.
3_ in plan, when I'm drawing my selection box before doing the BX shortcut, it would be great for the boundary of the box to be visible before I have to wait for the 3D view to get built. Maybe something like PS's marching ants line?