Oh dear, you should warn your fellows before asking for such camera-ui destroying feature

Checked yesterday on N9 and it works (a bit).
Then in the night with N950 and after fiddling with setting the camera-ui did not start anymore. Thought it was due to battery almost empty and recharged ig this morning. Started cam and the same: camera does not react. Close program or restart device.
So I checked with gconf and reset fastCapture to 'no'. Still the same! Then I unset full cam ui gconf and killed cam-ui and it came back!
Then set again continuous shutter mode and tried to shoot a series. Only one shot was made and after that cam-ui was again unresponsive.

So long story short: NO, on N950 it seems fastCapture does not work