What about adding Locator with specific tangent break.
Alot of occasions, we need to build surface that tangent/curvature to other adjacent surface with very specific angle break.
Ofcourse when we measure it with existing tangent locator, it gives non-tangent feed back.
So by adding new locator measure with input of angle difference (minus or plus sign) will save alot of time, rather than using the angle measure locator across the whole edge...