Edit track: Insert new point before start-after end of track

Right now, insert/edit trackpoint allows you to edit three points at once and insert new points in between. However, when one of them is the first or last point of a track, it's not possible to add a point before the first or after the last point. Of course the workaround is to move the first/last point and then create a new point in between and move it to the previous position.

This had two disadvantages:

• It's not as exact
• If the track had timestamps, the result is nonsense, as the old first/last point gets a new timestamp which is interpolated from the timestamps around it.

I propose to add an option to the context menu that appears when you long press a point: Usually, this has "Edit" and "Delete". For the first/last point, it should get an additional entry "Insert point before" or "Insert point after". The new point never gets a timestamp. From then on, all well-known operations are possible (move, add points in between, etc.). For inserting the new point, the "Edit point" dialog with all the usual options (Map center, location, POI, you name it) should be used.

I'm open for other implementations, of course...