Highlight "Terrain"

[kony16]

Would it be possible to add a hotkey for highlighting difficult terrain? While forrest is kinda obvious and moors are not too bad,
figuring which exact square is "rough" is quite difficult for me, especially when there's several of them close but not adjancent.
The "rough hill" is the worst offender. Something like those little optional weapon icons from sengoku jidai would be perfect.
On the same note, maybe also a "show map grid" toggle key?

[rbodleyscott]

Thanks for the suggestions.

[JaM2013]

also marshes are sometimes hard to spot.. I usually notice them when i want to move through and they reduce my moving range.