hermes,
No need to be mad - these are not bugs you're reporting, but rather design choices.
ORIGINAL: hermes_SK
1. Its impossible to hit buildings without enemies in it? I tried to hit a building with HE round and it says "sighting blocked". But I have a clear view. Now I think its possible to shot just on enemies in buildings, but not on buildings its self. Terrible bug to forget indirect fire.
It's definitely possible, just click near the edge of a building by the wall you want to hit with area fire. The HE fire box should partly or fully overlap the buildling, depending on the size of the round.
2. Where in god sake is smoke? Someone should say to developers that tanks use smoke in battle !
Yep, we know all about smoke, but implementing it is planned for the first expansion rather than the initial release. The time required to get it right was too long for the initial release, particularly since while it was used tactically, it was not widely featured in this campaign. For the expansion, we'll have artillery, tank and infantry smoke.
3. How to set Stuka targets? Stukas attacked targets on their own. I was not able to find a way to set targets for them. I can set targets for arty with spot button but cant handle Stukas???
All airpower does its own sighting and chooses its own targets. I'm a bit surprised that you lament the absence of smoke, which I agree is a historical feature, but want to individually target air support planes, which is definitely very ahistorical. We decided to model airpower as it would be viewed by a commander on the ground. There is even a small chance it will target your own side.
I just hope some mods will make this game playable. Until that Im off with this game.

I'm sorry you're upset, but #1 is definitely possible in the game as is, #2 is scheduled for the first expansion and #3 is historical.
Regards,
- Erik