Bilabial / labiodental distinction

Well, it's that time again. Yes, I'm starting a new project that has
little chance of getting anywhere near completion. Its working title is
Raleh /ra.leX/.

IPA and X-SAMPA don't give any values for labiodental plosives. However,
they (the l.d.p.'s) would seem to be pronounceable. Since they don't have
special values, should I conclude that they just don't sound different
than their bilabial equivalents? Or is it that the sounds don't appear in
natlangs?

Would people be able to distinguish between these? Is this neat feature I
made up totally useless, deserving of the scrap heap, ektera, ektera?

Helpless in the land of phoneticians,
Wright.

Picture yourself in a frog on a river...

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