Would like to see option to always have preview on. Also arrow controls for incremental measurement changes (as in transform) . These are available in many other parts of the interface.
This would speed up the process of creating an offset path.
Rob Hutchings commented
It doesn't look like this is moving beyond review anytime fast!
For anyone looking for a very affordable offset solution, look no further that Rick's Toolshed plugin here: https://rj-graffix.com/downloads/plugins/#toolshed
The offset can be preset to a specified distance, applied to open paths, and even be duplicated multiple times and then mirrored along the path.
Mark Gould commented
Also, it would be nice to have a box to click for *copies,* as exists in Transform, however the ability to offset in points or pixels, rather than as a percentage, as is currently in Transform.
The Hotdoor CADtools plug-in has a very useful offset the path either way, not all the way round. I wish Illustrator did this natively.