Rendering a movie snapshot can take hours, leaving Capture unusable until that job has completed. 

I did talk about this back in 2016, but two possible solutions could be....

1.  Adobe After Effects can render to a JPEG sequence across multiple machines on the same network.  This would require a small Capture plugin to place each node and some form of management app to handle the management of which node gets each frame.  

2. Like Vectorworks, a cloud rendering service that allows multiple render jobs to be processed in the cloud, leaving Capture free for other work.

It would also be very helpful to be able to select multiple still snapshots and submit them as a single render job.