If by "B3D" you mean "Blitz3D", that's incorrect. It does support them but it stretches them internally to the proper size.
Non-powers of two is not something that is widely supported on the hardware end. We aren't even contemplating using it at Epic ... for the next 2 or 3 foreseeable games, we're sticking with power of two textures.
Non-powers of two is not something that is widely supported on the hardware end. We aren't even contemplating using it at Epic ... for the next 2 or 3 foreseeable games, we're sticking with power of two textures.