clarry: I've completed the training & first mission under Wine, it runs fairly well. I'm getting some framerate drops when the enemies are firing back but I'm not sure what causes that.
One thing I wonder, are the SMGs (Thompson, Sten silenced) really supposed to dumbfuck inaccurate? Like, aim carefully at a stationary target at 25 meters, shoot one bullet, and it completely misses?
Framerate drops: can't it be sound related? Although there's usually also considerable amount of computing going on, the muzzle flash lights the environment, bullet trajectory is computed (it has reasonable ballistic model including ricochet-per-material-hit, so for example most of the guns can shoot through wooden plank easily, but only strongest machine guns will reliably cause damage through bricks, and almost nothing does pass the concrete), etc... But if your machine is fairly modern and the framedrop is considerable, I would first take a look on things like various drivers, maybe some logs of wine to see if it's not flooded by some particular stub-error. On my old notebok with other windows game I tried to install full DirectX and while it did help with many problems with graphics glitches, I had to switch off the DirectSound, that one didn't work well, taking lot of CPU.
About inaccurate aiming: the soldier stats do affect this, so in the early stage of game they are a bit annoyingly inaccurate, after few missions the stats will bump up a bit and it will feel better. Also make sure you are not right after running, lack of stamina will ruin the aim. To get best steady hand you should hit the ground. Shooting while standing is pretty much spray-and-pray tactic. And finally it's not that easy to hit target on 25m with SMG in real world :) So the game does indeed add some randomness to your careful aiming, watch the size of the cross symbol to have idea how accurate your shooting can be (IIRC it's almost 1:1 correlation, the inner area between white lines is the possible spray-area) ... although these guys should be seasoned veterans with top practice, so it may feel a bit annoying. Sometimes I let to shoot the AI, so I just manoeuvre them into position and stance and make sure they see the enemy well, then I switch to other one to let the AI sort it out, as you can note from the enemy shots, they are not that bad in this basic activity.