Hi Mathew,
Currently if you use this tool and draw from a low to a high the tool then offsets various angles from the high. However there is no functionality for the angles to be offset from the starting low which would make this tool more useful. I would like to suggest that the tool would be more practical if it could be amended slightly as follows.
When drawing from a low to a swing high rising angles are then offset from this fixed slope from the low. If drawing from a high to a swing low then declining angles are offset from this fixed slope from the high. Currently it is the other way around which also makes it somewhat counter-intuitive to use.
Thanks,
Brian