It would be nice to be able to import these updates into CinGG (and
also the previous "Bug fixes for running on a 4K monitor.
Not relevant because the bug fixes on a 4K monitor(of which some were also in 7.3) are a totally different implementation. CinGG was independently modified to include 4K in October 2019 (BT #25 as opened by Terje). I am unaware of ANY bugs in our implementation and it covers the entire Cinelerra program instead of just some places.
I "think" support of odd frame size in OpenGL may already be there, but if not, this is a possible improvement. Many of the OpenGL features in CinGG were also independently implemented.
Transparency Checkerboard is a distinct possibility though.