I searched through the Feature Requests and they're kind of old so started a new one

1. Add to the API information about the stream. Currently all that's said is if it's on or not. Please add information about the quality of the stream (at a minimum using the data for your status colors (red, yellow, orange, etc). Ideally in addition to the "color" status, I'd love to see other data that vmix has like connection status, errors, actual bitrate, etc. Companion could then use this in variables and feedback to at least have the "stream" button light a different color to attract attention when there's a problem.

2. Add to the API the ability to have the name of the stream changed. It would be nice to allow Companion to sent info to Vmix change the stream name without having to have volunteers go into vmix settings (or worse FORGET to change the name weekly).

3. Add to the API whether a transition is active or not. On physical switchers, when the trans rate is set to, say, 150 the AUTO TRAN light stays on the button while the transition is in progress. I do not see this in the API. In companion, this could be a feedback that lets the button light up during a transition. This should be applied for the 4 overlays as well.