Don't believe there is such a place. Typically universal remote control companies will seek out IR codes on their own, unless there is a specific demand for something and a customer will submit it, or they'll go to the manufacturer.

As for submitting to the community, that can be done on this site - assuming you have a protocol document that describes the IR code format in detail and then maps out the commands.

If you're able to convert these codes into the semi-universal Pronto Hex format, then that will go a long way as well because companies like Logitech, URC, RTI and pretty much everyone else can take that Pronto hex and import it into their own formats/databases.