> Also, often, when Ieft click on the 'Other Win' button in '2 Window' mode, it swaps to the destination window and stays there
I'm not sure what you mean, do you mean the tab doesn't get sent to the other window? Sounds like a bug, but I've never seen it. If you wouldn't mind, creating an issue on gitlab with some more info about your browser might help with figuring out what's going on.

As for the tab context menu, I could see how that could be useful. I'll create an issue to look into it.