I'd like to be able to right click a tab and see a menu item "Move to" which has a sub-menu of available windows to move it to, listed by the name I've given them.
Great idea. We already have Move Tab to New Window.
When there is more than one window this will change to "Move Tab" submenu which will list other windows and then "New Window" at the end of the menu. If there is only one window we keep "Move Tab to New Window".