Interval editing now uses a floating toolbar (click on header to open) and you can see changes on the chart before saving them. You can still drag the edges of intervals on the chart to edit.
How about a line/field to enter the times/distances like in runalyze.com, so different Intervalls can easy entered. like the 5 min warmup, 5x speed, rest,… etc.
I intended to make it possible to edit workout steps using the “Add Step” form but dropped that idea. It is tricky to do and once you get the hang of the syntax a little using the “Add Step” form it’s easier to just edit the text.