The AutoCAD 2010 Hatch improvements seem to be a big hit with the Beta customers. They love being able to grip edit non-associative hatches and they like the red circles that get displayed when the hatch command can’t find a valid boundary.
Also many customers have reported that hatch just works better. We did some bug fixes reported by customers so some drawings that couldn’t be hatched in previous releases including those far from 0,0 (or hatched incorrectly), hatch correctly in AutoCAD 2010.
Most Beta customers discovered the default grip edit behavior (stretch or add a vertex). They didn’t see the hover tooltip that informed them they could tap the CTRL key to toggle different options (Remove, Convert to Line/Arc). 
Tip courtesy of AutoCAD Product Designer Karen Mason
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From the Help Grip editing options vary by the hatch boundary type—polyline, circle, spline, or ellipse. With the vertex grip, you can add or remove. For a polyline segment, you can convert an edge grip into a line or arc. |
the work with the hatch boundary is great, but i guess why they don’t make this behavior available to polyline objects also.
Thanks for all the information you have posted.
Saludos.