None that I'm aware of, Skan. If you need double-sided geometry in 3DO, you will need to duplicate the faces and flip them before exporting the model. Be aware that painting on extremely thin geometry like that will bleed through to the opposite side, much like a heavy marker staining a desk through paper. 3DO has a Proximity slider option at the top while painting, but it won't help with thin geometry like that - so you may need to toggle the Paint Through Thin Geometry button next to the Proximity slider if you wish to avoid the bleed-through effect.
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Is it possible you guys add this feature in the future?
Thanks!