How about this for a feature enhancement - in the Multicam mode, to be able to output 2 or more takes in a split screen layout - typically side-by-side or one above the other. A range of templated split screen view layouts. Similar to the way that Zoom or Skype switch between single view and multi-speaker views. This would then require re-framing the split parts to center them correctly (which can sometimes be a tad fiddly in Vegas).
I recognise this can be done outside of multi-cam mode, though you would need to restore the tracks and use PIP or other methods. But to do this within Multi-cam mode could be most useful, I think. I saw a forum where this same question was posed - so I guess its not just me.
One alternative thought is to select any number of video tracks and present them using the multi-cam view technique but without the special multi-cam track. This would help queue up video from different sources which were not of the same occasion. I currently set the opacity of the top track to 50% so i can see 2 tracks, but it's a bit fiddly this way and only useful for 2 videos at a time. [Why - well I video Am-Dram productions on several performances and piece together a DVD from these - I select a master 'performance' but will overlay sections where the view on other performances was better - all a bit time consuming!].