CharlesT, do the sauces have to be warm or can they just be room temperature? What kind of dessert will be accompanied with the sauce? Are you thinking that people can choose which sauce they want and then serve themselves?
The first thing that came to mind is a more sophisticated sort of presentation. To have the dessert on the plate, and then drizzle the different sauces all around on different sides of the plate, then they can take a bit of cake, and a bit of each sauce. Then depending on which one they like, they can add more sauce.
Not sure if this would work for your setting though.