@Greenham "If one of you fine experts..." left me speechless for a second.
Addressing people, who were all willing to help you out from the getgo, in such a cynical manner and still expecting them to aid further, is just childish man... That's not how adult conversations play out... at least, not where I come from. No need to insult.
Nevertheless, here is one On-Topic response:
I see you mention "dozens of routes you already made" and it seems that you expect them to have shaping and via points automatically (after the launch of this functionality), which simply is not correct. You shall edit every existing route, and change the regular waypoints to viapoints through the waypoint menu if you need viapoints in that specific route. (Click the icon in the waypoint menu per waypoint that shall become viapoint).
I cannot assist you any further regarding the actual Garmin stuff, but only with general MRA matters.