Difficult terrain drawing tool

I was thinking about a tool that will draw some kind of symbols on a corner of every square to represent difficult terrain (maybe triangular shape like D&d), or other kind of terrains. I know it could add them easily when I build my map but having the tool inside the editor will make adjustment based on the dimension of the map easy. 

If the system recognizes the square as difficult terrian, then things the measuring tool could also build that into it's calculations when crossing that square.  Good idea.

+ 1 could even make a terrain drawing tool that could input simple terrain markers for thick jungle or high moutnians and so on. 

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