@Guzzist
Lots of thoughts - let's sort them out
Firstly, this topic is about "MRA running on DMD", so everything related to "open in MRA" or "run/navigate with MRA" is probably right, I haven't checked, but out of scope here. No offence intended!
My addition to your summary is about "how to create points/items in MRA that show up in DMD as a waypoint (GPX terminology)". There are several ways to do so, right, but either way, we have to make sure they appear in tab #2 ("manage"). All these items, and only these items, are exported as <wpt> and therefore become waypoints in DMD. Do you agree on this?
Rereading my posting, there's a typo in the last sentence:
So if you want to transfer MRA POIs to DMD2 (where they are called waypoints), you have to insert them in tab #3.
That's wrong, I meant: "...you have to insert them in tab #2".
Finally, and this is a common misunderstanding as well, DMD will not "guide" you to waypoints (GPX terminology). You have a line on the map you can follow, and you may get turn-by-turn instructions; however, they will guide you through the route or track, but not to waypoints at all!
Waypoints, on the other hand, are announced, and you'll get the remaining distance to the next one along the route/track, even if they are not precisely located "on the line". But you will not be guided to them; there's no "turn right now", they're just along.
To compare this with MRA: You see the line, you get TBTs that guide you from one waypoint (MRA terminology) to another, you get the distance to the next waypoint, and they are announced. POIs, on the other hand, will show up on the map, but there's no guidance to them.
And here's what drives most users crazy: waypoints are announced in both MRA and DMD, and you get the distance to them. It sounds the same, but it refers to entirely different objects! @Con-Hennekens : yes, it's semantics