Esoteric,
As a game sound design engineer that exports A LOT of videos from Spine to MOV, is there any chance you guys would consider adding this as an encoding option? Pro Res Proxy is one of the most common codecs we use. Just one less step in having to bring it into Shutter Encoder to encode again 
. Any thoughts on this are appreciated.
Export MOV using Apple Pro Res Proxy
Spine has added support for ProRes encoding since version 4.1.21-beta, which includes the ability to export with alpha transparency by checking the "Transparent" option. However, specific support for ProRes Proxy as an encoding option is not mentioned in the available contexts. While ProRes support is available, it may not specifically include the ProRes Proxy variant. If this specific codec is crucial for your workflow, it might be worth exploring the current ProRes options in Spine to see if they meet your needs or continue using external tools like Shutter Encoder for further encoding.