I've come up with another script idea to test out. This world started out as a standard Fractal Terrains 3 randomly generated map, with no manual tweaking. The script is an attempt to fix FT's normal result of continents with central mountain ranges.

Please take a look at this and see if the landmasses look reasonably plausible. There has been no manual modifications made, all with scripts and standard menu options (and a simple selection modification in Photoshop). Please feel free to point out anything you think doesn't look realistic. I freely admit that there was no attempt to define continental plates. I have no doubt there are plenty of issues with it.

Click image for larger version. 

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Thanks in advance for any feedback.