Thanks for those suggestions Mark.
An added feature is that it would be easy to add a direction at a given point given that one can just click the Hill profile (although added granularity like using the Shift button when dragging would help ....)
I can use the route slider and see my position along a route. But there's no link to the Hills profile (ie I don't see where I am in elevation).
I can mouse-over the Hill profile and see my position along a route. But if zoomed in too far, the position moves off-screen and I have to move the map view accordingly.
A really useful way of working (a top feature in the now-defunct Tracklogs app) is to drag along the Hills profile and have the map move to keep the actual position on the route in the screen view, whatever the zoom level.
This is a great way of zooming in to max and slowly following a route.
Mark