All of this added table top gets over used. Yes it works well for sanding space if at the correct height. Having the router table involved sort of works against that approach.
By not using extension tubes between the auxillary main table and whatever I have to the far left - I can adjust table height to support the sanding task.
Going to the drill press mode makes this all seem to be a bit to much extra work. When faced with a lot of crosscutting of longer lumber - fifteen minutes of setup certainly eliminates any complaint about not enough table space. Of course, the outfeed table needs to be added into the whole setup.
The extra miter slots seem like they should be really handy. Strangely, I have not had the opportunity to benefit from their existence. They do align very favorably (+-.004") with the miter slots on the main table.