The multicamera editing function in Vegas is a good concept but using it in practice has never truly worked for me. Even with just two sources and the preview windows size and res very low.
Here's what I have: you can hover over any video track and I instantly show you what's there. So you can decide what's in and what's out.
With this, assuming there's enough interest in something like this, I can optimize it further and do it like in Vegas with a few quirks. Like, you would select several tracks and create a multi-track. When hovering the multi-track, you can choose to view all at once, or a single video and have a hotkey to switch between videos, and another hotkey to select that video as "current video".