Cutscene, has-pressed-key, and many other sexps we wish we had don't work in multi yet, no. It seems no one has taken up and completed this task in the past, though it would be very cool if someone were to do so, so if someone is willing to put in the time and effort it is fully possible to make campaigns for multi.
Obviously if there are plans to convert, the original makers should be asked, and if anyone is intrested in trying but doesn't know how to FRED there are plenty of people on IRC who would be willing to help in addition to the various guides.
I wouldn't like to make a call on whether the extra effort was worth it though.
After playing Plunder (as example) both as a quick crossover and after matth properly converted it, the difference is astounding and very very worth it. Single player insane just doesnt cut it with 4+ experienced players who also have 5 or more lives each.