If you open a saved route, then choose Edit route on the right of the screen. You then should get an Edit drop down menu on the left of the screen above the cue sheet, one of the drop down options is Reverse Route.
Don't know if that will do what you need?
Not quite, but it might help with dragging the route around one-way systems the 'wrong way'. Cheers.
@hippy started
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If you open a saved route, then choose Edit route on the right of the screen. You then should get an Edit drop down menu on the left of the screen above the cue sheet, one of the drop down options is Reverse Route.
Don't know if that will do what you need?