This is very much needed.
There is a workaround. It took me a while to figure out all of the code but once you invest time to learn ffmpeg then you can simply export as frames and pause and resume at any frame. This makes it so much more convenient as you can process for 2 hours then use your computer for a game or zoom call and then flip back on processing on the very next frame.
I think topaz labs should write a quick ffmpeg guide especially considering the audio handling and lack of audio on mac.
With exporting by frames and using ffmpeg you can 1) pause/resume 2) export losslessly 3) compress yourself with desired parameters including h265 4) keep the original audio.
To be honest you end up using the same 4 or 5 strings of commands over and over and simply changing filename so it becomes fast.
If anyone wants some code tips or examples feel free to pm me.
That said - this workaround should not be necessary and I agree Topaz Labs has to make it built into the program as soon as possible.