I tried it and can't figure it out :-(
I can create new profile and yes the navigation is a straight line, which is perfect. However I can't find how to change the type of navigation (straight line vs. anything else) without changing the profile setting?
Example: I have a certain renderer and other maps settings set which suits me. Now I want to get from my location to a point on the map. I choose the profile to be used with these settings and before pressing GO I would like to be able to choose whether I want to stick to roads or fly over using the straight line, similarly I often want to change 'use roads' to 'straight line' mode while re-calculating the route. Simply to have the drop down menu which is available on profile setting page on navigation setup page. That I guess is not possible, correct?
Nevertheless, the airplane mode is what I was looking for, so thank you for enlightening me.