Thanks for the ton of encouragement, and yes, I know some of your stuff, which I really like
Flora, clouds, and textures are already scheduled for the next major releases (where major currently means the digit behind the dot, read, for picogen 0.4, 0.5, etc.).
A third advantage over freeware-Terragen comes to mind: No artifical limitations, like maximum heightmap size. I should integrate this into my propaganda