Boken? Did you see my suggestion on the other thread? By you asking if the "boken[sic] will be too severe", I think there's alot of fundamentals of photography you're missing (weird since you already have a very nice lens lineup).
As for the BOKEH, the amount of background blur depends on the f-stop, the subject-camera distance, and the subject-background distance. If the bokeh is too severe (did you mean to write "DOF is too shallow"), you can ALWAYS stop the lens down from f/1.4 to get what you need in focus.
As for group shots, you might have to stand a bit back to get a bunch of people in with 50mm. Surely you have alot of experience as to what the 50mm focal length gives you in terms of coverage, right?
Finally, did you use direct flash on that shot? Don't
You have the 360, so experiment with using that and bouncing it off of stuff. (walls, ceilings, anything white/neutral)
Good luck!