Check out this long post
http://www.mp3car.com/vbulletin/showthread.php?t=37702
You can customize a lot features in IGuidance you will need to create a theme.ini file and find the info needed in the other post. That will let you change text size and road thickness.
You can also change you the arrow icon and the size of the zoom button with Resource Hacker.
Not sure about showing cross streets, You might be able to do something like that with 0L33L zoom tool if you could work out where the info is displayed in the same place.
Here is a screenshot of my setup.
