Polyline and perimeter measurements have great editing options including adding/removing control points, splitting at control points and resuming measurements.
The ability to merge counts is another great feature of review.
My suggestion is to add the ability to merge polylines or perimeter measurements.
Working in the construction industry I can see multiple situations when this could be useful - especially where an estimator has measured lengths in multiple small segments, but a superintendent wants to know what the entire length of a series of segments adds up to.
