You should probably post this to the suggestions forum so it doesn't get lost.
I did day 7 with guns... Granted, it was Q1 9mm and Q4 hunting rifle and so I ran through all my 9mm before the end, but I did fine with that. But it would be a challenge for new players. I think the long lasting horde night on day 7 is a bit much. Of course, I was on 2 hour days, which made it last twice as long.
I agree that forest biome would have larger towns, at least as an option. I'm playing with larger towns in my game and it is far better than the RWG map I started with.
Having a road go straight through a town greatly reduces variation in the towns, especially small towns. The tile system gives you variety in how things look, but if you have a town with a road straight through, you lose a lot of the variability and can lost out on some POI that won't fit on such tiles. It is something where gameplay trumps realism.
They said they are working on more stamps. But an underground river is extremely unlikely. Even getting tunnels has a low chance of happening, so rivers underground are even less. Also, any gaps underground can break stability of POI and bases, so not a great option even if it would be cool to see. That said, you can make a wilderness POI that has an underground lake, river, cavern, etc. You just have to make sure the ceiling stability is good.
You won't get that with RWG. It is intended to be a simple and easy to use generator. For such control, you will need a third party generator or else make the map by hand. You *can* paint the biome in any image editor for a RWG map, but it can impact the new trader progression stuff to some extent.