Precise sizing and positioning of overlays is impossible because the screen resolution in the Edit Overlay pop-up is lower than that of the produced HD video. Please add a Zoom capability in Edit Overlay or enable some other means of precise alignment such as letting the user edit the scale and location coordinates numerically. An example of why this is needed is a virtual choir video in which there is a regular grid of overlays showing each of the choristers. Even if the overlays are lined up to the exact pixel in Edit Overlay and in the preview, they still turn out to be slightly misaligned in the final video and it looks amateurish.
Thanks in advance if you can solve this problem.