The Partial Correction Tool already supports Circular (gradual), Rectangular (gradual) and Brush options. New options include Curve and Polygon.  On creation of a Curve or Polygon area, you can click to add handles for resizing and reshaping the region.

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Curve and Polygon Option in Partial Correction Tool

	The Partial correction tool is a tool for making corrections to specific areas of your photo. Designate specific areas in your photo for correction for improving subjects darkened by back lighting, or for fine tuning the white balance on subjects that can appear too bright.
The tools included in the Partial Correction Tool include: Circular, Gradual, Brush, Curve and Polygon.

 

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Partial Correction Tools

Partial Correction Tool: Circular Option Select the circular option and drag to create a circular area over your photo. You can select and drag the handles to adjust the outer edges of the effect, or drag from the center to move the filter effect.
Partial Correction Tool: Gradual Option Select the Gradual option and then drag to create a banded area over your photo. You can select and drag the top or bottom edges to align to edges in your photo or drag the center line to adjust the median line of the effect.
Partial Correction Tool: Brush Option Select the Brush option to activate the paintbrush tool. Use the paintbrush tool to 'paint' the areas to adjust them. You can modify the size of the brush and feathering effect on the edges of the brush.
Partial Correction Tool: Curve Option Select the Curve option to activate the curve creation tool. Click to add points, then add additional points along the line of the curve. You can drag the points to adjust the shape, or right-click points to delete them.
Partial Correction Tool: Polygon Option Select the Polygon option to activate the polygon creation tool. Click to add points, then click to add additional points along the lines. You can drag points to adjust the shape of the correction area or right-click points to delete them.