Wow, first of all, thanks for so many suggestions! 
Better cross over in mixed stone/dirt areas: Yeah that's indeed a small problem currently. Not sure if we can fix it, since all our approaches had different downsides. One workaround would be to remove the problematic area with the pickaxe. Let's see if we find a better solution.
Rake: That's related to the fact that the rake was originally implemented to smooth out the terrain instead of leveling it. Technically there is the ability to restrict digging to a specific level (i.e. only blocks above this level will be removed), but we did not find yet a smart way to combine this feature with the existing tools.
Soon we will add the ability to "stake out" an area, which only allows you to remove ground inside this area (helpful for creating a nice excavation pit), but this does not really solve the problem you mentioned...
Sledgehammer: Indeed, the sledgehammer generally does not behave as intended. We will fix it.
Wood grain: We can change it so that they are generally vertically oriented. An option to change it while placing would also be possible, but it's difficult to integrate it for blocks, since you don't see a texture preview when placing blocks (only this wireframe), and we don't like to change that.
Climbing: That a really complicated topic. But I agree that it is currently not the best solution that players can actually climb every mountain with little effort. We will work on it in the future!
Adjusting walkspeed depending on the steepness may be problematic, we tried it a long time ago, but resulted in a very strange walk behaviour. Difficult to explain. We will have a look at it again and let's see if we can tweak it.
Probably we change the climbing behaviour when we implement stuff like ropes etc.
Roofing materials: Coming soon! 
Wood blocks: We want to remove some of the old textures (especially some of the ornament tiles), and also want to finally add some textures for the black "N/A" textures^^ There will be definitely some wood textures among the new textures
Block tinting: Not sure about that. It sounds pretty cool, but for consistency, we should think about a general overhaul of the block system, splitting into color and pattern. This is a pretty big change and I think it's maybe already too late to do it.
Alternatively we can add some more white colored plaster textures with different patterns. In the future we want to implement the ability to paint blocks, so you can combine the white plaster textures with a specific color.
Fires/Lights: Most of them are planned and coming soon^^
Seatings: Sounds good! We will do it (as a nice side effect, a throne could be helpful for @StarMeisters project )
Misc: More tables and dressers are in the work. Tapestries and flags are also coming (we want to combine them with the custom image feature), but still take some time until they're ready.
