As a suggestion: Use an Apple-style slider "slide to edit". With the slider locked, the only thing that happens when somebody touches the screen is to bring up the airspace/waypoint/navaid/leg information window (disappearing in a few seconds if possible). And when someone slides or pinches over the screen, the map slides or zooms as appropriate, but will revert to the normal aircraft view (north up or track up as appropriate) after a few seconds. With the slider unlocked, the current behavior is used, allowing you to change the route, add waypoints and such.