Great question — answering as the UphillTech team:
In my own practice, I just cook the sugar to a higher temperature in order to make a nougat firm enough to not spread. However, I have recipes suggesting the use of rice paper, and have eaten store-bought nougat that used rice paper on one or two sides of the nougat to hold it together (and minimize sticky fingers for the people eating it.) I can vouch for rice paper tasting just fine with the rest of the nougat.
Full answer by Guildenstern: https://cooking.stackexchange.com/a/94937 (CC BY-SA 4.0).
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