On some maps it is hard to tell where you can walk or not, which is critical for early build decisions.
For example this replay I realise early on that there is only one chokepoint on the map so I dont defend the expansion even though it looks open. The other player doesnt realise the choke points, and at minute 7 is defending an expansion that is not under threat - and has less units than me in the middle. So I can get an advantage that is game defining but not fun at all. https://replay.faforever.com/13282178.
What would be cool is if there was a way to visualize where you can walk.
It is possible to generate a useful 'strategic overlay' image where red is unpathable, blue is underwater, etc. Then you can put the image on the screen as a decal and change the LOD so that it only appears when totally zoomed out. In this screenshot you can see one i made manually. It's not perfectly positioned but you can see its marking red & yellow where you cant walk and white where you can walk.
Not sure if its possible but perhaps a shortcut key could toggle the decal on and off.
This feature would be useful for all maps to be honest (including non mapgen) but with mapgen its much more important because you dont know the map before you play it. It's no fun to spend 15 minutes on a dud game because one player fatally misunderstood the map.