Multi-point Polygon Drawing Tool

In addition to the line drawing tool, the rectangle tool, and free hand drawing tool, something very useful, and needed for scientific users is a multi-point polygon drawing tool. A color fill tool with transparency option could be helpful as well. In my particular situation, I need the ability to quickly draw polygons to mark areas on a weather map that are in danger. This feature would be beneficial to thousands of followers of meteorological users and will help save lives.