Well focusing is simple matter, manual focus.
Shutter and mirrorslap is much more difficult, noise is there, and I disagree that background noise makes noise unhearable from few meters away, it makes the noise less noticeable but I can tell you a true story from last summer when I still had my K10D (Yes I know that my K-7 is much silenter, but itīs not noiseless)
Well I was shooting timelapse at local festival here in Finland. I setuped my K10D to the back corner of a large hall that was converted to a club during the festival and using pclix setuped my camera to take photos at 1sec intervals. Well even when there were lots of music played hard (it was a club afterall) I could hear the mirror slap to other side of the hall. I started sweating as i wondered if that noise bothers someone nearby camera because I heard it still in club situation 20 meters away.
Well people near camera certainly noticed it, but thankully they werenīt that angry
. And also interval makes the noise more annoying than a single mirrorslap, so I would have been okay just snapping still pictures.
End of story, but yes most time in silent situation mirror slap is a problem, best way is to try and time your photos so that it wonīt annoy the rest of the people
-Juho