[ale] Two-part Bit Torrent Client?

[dcorbin at machturtle.com (David Corbin)]

I'm only looking at bit torrent for the first time, so perhaps I'm way out of 
bounds.  It seems to me there would be some value in having a two part client 
for those of us behind a NAT.  Specifically, I'm thinking that there could be 
a server component on, or just outside the NATter.  It would be the true 
client of the bit torrent protocol, and would be a daemon.  Then, people 
inside the NAT could run clients that would talk to this server component.

I believe, this would avoid the need to punch a whole in my firewall to get 
maximal throughput and follow good netiquette.  One could even make the 
server component "stay connected" longer than the actual user, if necessary 
to fulfill "good behavior".

Is there such a thing?  Is this reasonable?

David