Version 4! It's far away! [:D]

But in a way you're not wrong to bypass v3, because Sweet Home 3D will probably jump from version 2.x directly to version 4.x, with no version 3.x. Sweet Home 3D 3.0 with two 3 digits looks too strange... [;)]

- do not include floor when exporting OBJ

I'll probably create a plug-in for that in the coming weeks. It's easier for me than adding an option in save dialog.

- do not restart texture on wall with every door or window

Hum, I think you missed I already fixed that one.

- install everything in one directory (easier back-up)
- let user choose installation directory (makes it possible to have different versions on computer)

This comes with portability which should be available as an option.
But the fact that files are separated can be nice too when you upgrade from on version to the other.

- no maximum elevation

I increased the maximum elevation to 25m in the coming version.
Going higher lets appear too many black zones at the horizon.

- auto-save feature

Without blocking current user input? [;)]

- allow re-organization of standard libraries
- allow deleting standard furniture items one by one

Not so easy (that's why it's not available yet).

- give virtual visitor fixed size, independent of zooming in or out

That could be an option, but I'm not sure it's so useful.
The size of the visitor in the current version is supposed to be proportional to his height, and this should help users to place enough space around furniture.

- when dragging an object into the design you first have to de-select it before you can edit its properties; right-clicking on the inserted object now opens the “import furniture” window; this often leads to unexpected crashes

I think this is a focus management issue (the catalog keeps the focus once you dropped the piece and right clicking doesn't transfer focus to the view where you clicked).
Note that if you double-click on the piece added to the plan, it works correctly.

- when importing textures allow both values to be larger than 999

What max value would you like?

- put floors and walls in the parts list; ideally, make it possible to switch between the furniture list and the walls list

What columns would you see in that list?

- change the tab-order in the colour picker so that it goes HSV and then RGB (and not HR-SG-VB); also highlight the values when tabbing to make changing them easier (if possible; maybe this depends on the operating system?)

I'm not the programmer of the colour picker, and miserably it's not easy to change its behavior, but I'll try to improve that.

- add layers

I'm still not convinced by this feature. [:(]

- add the possibility to export as “zip” (in the file menu); saves doing it by hand

What would be the difference with Save and compress?

- make it possible to organise and browse textures in the same way as furniture
- multiple cameras instead of just one

This should be included in a v5 wishlist! [;)]

- a solution to “make light”; illumination now doesn't give light: the renderer uses standard settings to light the scene; it would be great to be able to control the individual lighting of the lamps used, and give the scene a more realistic appearance
- better render engine(s)

Lights management can be improved only if rendering engines can handle them easily.

- in “Modify Furniture” you can check “visible”; ideally there would be two check boxes here: “visible on plan” and “visible in 3D”

Why not...

- z-axis rotation for furniture

I think you mean horizontal axis. I have to study that. As rotations around multiple axis is not a commutative operation, I'm not sure it would be always so simple to use.

- z-axis rotation for walls; make it possible to make “leaning walls”; not all houses have vertical walls only

Leaning walls can also be seen as sloping ceiling. [;)]

- doors and windows that adapt automatically to sloping walls and become sloping as well

I'm afraid that automatic computing of this feature is difficult and feedback even more difficult: should a window be oriented automatically as soon as it doesn't belong to a wall and under a ceiling?

- insert multiple objects on top of each other in walls

I agree it would be nice... [:)]