@22_Psych:
I am using this in our main MP mission and so far it has worked on all clients without any problem. Only when there's a lot of chatter at the same time then the speech fragments can get mixed around. However, that doesn't affect stability.
By coding this MP Mission with a lot of self-made effects (smoke, time&weather change, HDS, EvacHelis, random mission objectives etcpp) I learned a lot about SP vs MP mode.
I plan to create a sort of SP-MP matrix to never forget again what needs to be run on the server vs all clients an minimize development time ;D
Cheers,
Victor