When was this feature introduced?! It only took me 200+ hours to discover, hahah hah. I switch between this game and Fallout and I find the key bindings on FO to be more convenient. DA:I I've found has a few redundant ones. Like was it so necessary to have keys that did the same thing as the mouse and then not have a click to move on RMB?
Auto-run has been in the game since release.
Click-to-move isn't supported because the walk mesh is dumb (there are a lot of places you can't get to because the walk mesh can't handle height transitions). You'd be in a place that you jumped to or want to get to a place you need to jump to reach, but clicking to move would do nothing (since the game has no pathfinding data for where you are or want to go).
It is supported in tactical view, but it has the limitations described above and can behave strangely. Maybe they'll support it in exploration view in the next game, but it seems unlikely they'll try to add it to Inquisition at this point.