Have you considered adding a siding (or two) that leads into the corners, adding more switched of local industries. This generally does not take up more room, and gets the trains into the unused corners of the layout. the sidings may only hold one or two cars, however I find this enough if you enjoy switching on the layout.
Another option is to make the roads at an angle to the sides of the table, which may increase the illusion length of the road moving thru town. This would also allow you to place the road crossings away from the switches, where you can then use the fastrack road crossing track sections.
Looks like a good layout.
Joe K
