Can I bake a static mesh at runtime into a nanite mesh? Our game supports user imported content at runtime. If not do we have any idea when it will added?
Nope. No plans for it either.
Would it be allowed to modify the source so that you could do this at runtime, or would that be disallowed due to it being editor functionality?
You can theoretically write your own generator for the nanite data… but that is not a small task.
The editor one is not really useful at runtime. It takes minutes to process meshes.