Can the video quality in trimmer window be changed? (like in preview window with the quality settings).I use a lot the trimmer window and it would be nice to be able to adjust the video quality to for instance Preview>Half.

This is neccescary for smooth playback in trimmer window, otherwise 4k editing is not possible without smooth playback. For some reason proxies don't work in trimmer and the performance compared to the preview window is very poor (even with Vegas15 and 1080ti video card).

So, is this possible?