1. The color format (pixel format) / Type setting in DVRS selects how the frame data is sent from DVRS to "Voukoder Pro", the "Format" dropdown in "Voukoder Pros" encoder settings is the format that it should have in the exported video.
So yes, the rule of thumb is: Select the equal or better format in DVRS.
If you select a lower format in DVRS it first get upconverted (i.e. from 8 bit to 10 bit), but after all it'd be still 8 bit visually.
So why didn't I only hardcode only YUV444 16 bit? For speed reasons. The less format conversations we have the faster the export.
2. Does it really add a timecode track? I'll check this.
3. Try to set the "Data Levels" in DVRS under "Advanced Settings" to "Video" instead of "Auto". This should help.. For some reason DVRS tells Voukoder Pro the wrong value in "Auto" mode.
Edit: Did you set the color transfer characteristics on purpose to "gamma22" (bt470)?