Garmin Edge Touring can't do car, walking, or straight-line routing directions? I previously owned an Edge 605, and recently replaced it with an Edge Touring.  One key feature which I can't figure out on the Edge Touring is Car or Pedestrian routing.  On the 605 you could choose "Car/Motorcycle," "Cycling," or "Pedestrian" routing.   The Edge Touring however only seems to offer "Cycling," "Tour Cycling," or "Mountain Biking."

This is a serious issue for me because I use the device in mixed environments away from home, such as a trip where I do walking, cycling, and driving on a single trip.  Whereas the best road cycling directions on the Edge 605 were actually given by the Car mode with Highways disabled, I can't figure out how to get decent driving directions on the Edge Touring.  Is it even possible?  If it's not possible on the Edge Touring, what about on the Edge 800, 810, or 1000?  This information doesn't appear to be listed on Garmin's own site, nor can I discern it from the various product reviews online.

Similarly I miss the "Straight Line" style navigation from the Edge 605--sometimes there is no known route but you still want the distance-to-destination and direction pointing to work; I have also failed to figure out how to do this on the Edge Touring.

If it helps, I am using the City Navigator maps for Southeast Asia...the map data is all there, just the routing capabilities seem lacking on the Touring model.  I also used some OpenStreetMap files in Asia which worked OK but again the device only offers bicycle routing whereas the old models offered car routing with the same maps.
There is a website called http://www.dcrainmaker.com please check out page http://www.dcrainmaker.com/2013/08/garmin-touring-computer.html for the full guide however to answer your question and encase it disappears;

You can also specify if you want to start the route from where you are, or from another point on the map.

Once you’ve given it some instructions it’ll go off and come back with three routes (it’s like Monty Python – everything is in threes).  It did take a bit of time (perhaps 2 minutes) to come up with the routes.  Each route is roughly the distance you’ve specified, and all routes come back to where you started.

You can select any given route option to get a map overview:
There are a number of settings around routing and navigation within the options (applicable to round trip routing and generic routing), including how the unit routes and whether it, for example, minimizes routes with hills. This point here is were you select routing mode. it's not everything you were after but should give you a good help towards it. 

Full specifications for the device, versus other devices, are at the bottom of his page.