Spatial split polygon with lines

[Philip]

Sometimes we may have polygons, such as county boundaries, and need to split the polygons into smaller areas using polylines, such as roads. Please consider adding a polygon split by lines tool. I imagine it could be like the Poly-Split tool, but accept two inputs of a polygon field and a polyline field.

[StephenR]

In addition, a split by point tool would be useful too.  There are many times when I need to split a polyline at certain points.