I came across only a few programs which can modify the tile flags in the art.mul file. And they all stop at item 0x3fff. This is the only program (that I've found) that will even show tiles above 0x3fff. I have really been enjoying UOFiddler (as I get to know it better) and think this feature would make adding or changing tiles easier.

Thanks!
Thagoras

Have you looked at the tiledata tab?

How could I have overlooked that? Thank you so much!!!