@flyinfrog Thanks for using the plugin!!!
In the plugin, you can go settings, then go to the speed range slider, and select slow. Then you can go to 2km/h. I can make it lower if you want.
The speed set in the plugin, is sent to the route planner. Setting the speed in the route planner, will not set the speed in the plugin (at the moment).
Loading other models is possible, but not available yet. It would mean loading each point separately. (the same as selecting a higher VFR level currently. ) However, I use a lot more points when calculating the airspeed, and will probably take too long. Will try this when I have the time.