I also used camkeyd for that. I can add a visual button as well, but since it will be in the upper toolbar it will be small so again its the unconfortable to be done while driving.

When I will finally get to write the new UI, I will change that as well, but for now I am doing some big rewrite to the network layer of the application.
Regarding that, my current blocker bug is that the map tiles download queue is being clogged by 2 tiles that does not exist on the server and that kinda break the draw of the road if the map was not previously downloaded. I think I know the cause and if I am right it will take a few more sleepless nights and atleast one test drive to my workplace (which is now 1hr instead of merely 5 min) before a new release.

So far it feels that my rewrite gave another preformance boost with much less screen freeze - but I will let you decide on that once released.

For all the people that are starting to be frusterated by the time its takes me to release the new version: see the changes I'm doing to the code here - if it looks like a gibberish to you, imagine like what it feels like diving into it...