A compiled list of "flatten" areas.

This may be in the wrong forum, but is there a link or is there a list that is being compiled for all the areas that could use a flatten command. These commands are used to correct some of the Mesh anomolies that create false "mesa's" or HUGE CANYONS. While they are fun to fly through, eventually you want to rid your self of them. Is there an ongoing list of where these are, and does the flatten command work the sameway as in previous versions?