More layouts and customization options for V3
If you mean including Shorts and Livestreams within the "Uploaded Videos" navigation item on Channels3, then I am not currently capable of doing that. The chances of this changing are extremely low, as I have little interest in doing so.
The only option would be to add dedicated shorts and live navigation items alongside "Uploaded Videos" and "Playlists". I'm sure I don't need to say this, but the fact that I'm aware of this doesn't mean I'm getting to it anytime soon.
I'd recommend making it so livestreams (and maybe shorts, if there's a way to have them show as regular video) show up in a channel's video tab, as it's hard to find them as it stands.