Portnumbers in the range 49152 through 65535 http://www.iana.org/assignments/port-numbers

As for simultanious downloads, it all depends on your downspeed and system. I don't use Limewire anymore, so nothing works best for me.

Uploads should be throttled at at least 5KB/s under maximum and if acting as an UltraPeer probably closer to 15KB/s under maximum.

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Limewire 4.12.3 / Newest Phex / Newest Azureus

I recommend using either an old Limewire version without BitTorrent support or Phex for Gnutella, Azureus is BitTorrent. None of this Limewire Gnutellatorrent hybrid crap.