Jim,
I, too am looking for a tool to use with flight planning. I live near the great lakes and often fly over water. Depending on my altitude, I like to know how wide that stretch of water is to determine if the shore is within my glide distance. It would be very convenient to just point to the screen and be able to see how far it is between two finger taps.
This is, of course, one of the great strengths of having a touch-screen - simple access to any point on the screen with just a tap. I hope Brian and the rest of the team see the value in this, though I'm sure they have a very long list of "cool" features waiting to be coded. They do such an awesome job!
Rich