Hi all.
Doing some planning recently, I came across the same limitation as above, but had an idea about how to solve the issue fairly (??) easily.
I can manually add a 'Point of Interest' (POI) - which establishes a marker on my map, but does not affect the route planning Waypoints etc.
If I could add such a POI as a result of a location search instead of manually, that's half of the problem solved.
As an additional step, if a POI could be 'converted' to a new Waypoint between existing points (xx) and (yy), then the problem is resolved, and adding detours, interesting places to a route becomes SO much easier ....
Just my further thoughts - hope this helps.
Cheers, Jem