Don't forget the [*] for each item 
Inventory - Chest: A 'Switch-all-the-items-to-the-chest/inventory'-button would be great to make item management even faster. Also please make the 'use'-key close chests as well.
That's in the works 
In creative mode, when you are using the flattening tool, it would be nice to have a third key (e.g. mouse3) to automatically rise or lower the ground to the level of the flattening tool
A tool that brings the terrain to a desired elevation was planned anyway... maybe it makes sense to use a third button for the flattening tool. We will think about that^^
Delete favorite list for textures on the workbenches and replace it with a history list
We will also think about that
Someting similiar I want to suggest for the block forms: I think that the preview window should not start with the regular cube but instead with the last used form
Yeah, definitely. It was anyway our intention that the crafting menu automatically jumps to the last used recipe. This would apply to the last used variation or block shape, too 
Make it possible to e.g. attach the end of a plank to a wall, then change the rotation of that plank but without it moveing, so that the end is still attached to the wall.
This will be done when the construction system has been rewritten, which will happen very soon 
A telescope: Besides the modell for it, we would only need a high resolution sky texture and high levels of zoom for the telescope.
I really like that idea. The sky urgently needs a rework, that's for sure, but something like a telescope might be a nice addition. We keep that in mind!
The game needs civilization: This could be very simple at the start
Hehe, now we're coming to a pretty complicated topic
Npc's are planned, but implementing them (especially when they should be capable of doing something more complex than just standing around) needs a lot of attention... I'd also prefer to wait until our new playermodel(s) are ready, I don't want to put any more effort into the current models, since they will be discarded anyway. Apart from that, we need to implement dungeons first (this is going to happen after the water update), since this includes - among others - randomly spawned shacks in the woods, and since dungeons will also contain enemies in the long run, we will have everything in place to implement something like an unfriendly lumberjack living in the woods 
Let us build lines of blocks vertically (also with showing the number of the blocks being placed).
That's on our list^^
Maybe the solution is to have the default grid in the world and once you choose a custom orientation (not a 90 degree increment) then you effectively spawn a new mini grid that nearby blocks placed can snap to instead of the default grid.
Basically that's a good idea, but unfortuantely this is going to be very complicated to implement
The current block system isn't capable of having 45 degree rotations anyway, but that's going to change. Let's see how well it works with the reworked construction system, at least we have a better overview then about how to improve it 
I don't know much about writing mods nor if Rising World has a finalized API that would allow mods to be written
Currently Rising World is as moddable as Minecraft was in the early days
However, it's advisable to wait until the game goes into beta stage before working on bigger mods. Also, the upcoming Java API will be a first step to make modding easier 
I think the Z zoom is still too much by the way.
Once items like binoculars are available, we will probably remove the Z zoom feature 