(apologies if this message doesn't thread well, my list subscription was 
misconfigured, fixed now).

>  Perhaps udpgw instances can be run along side all Tor exit nodes?

Isn't the DDoS potential extremely high if Tor allows UDP? Since there's no 
flow control with the end server, a malicious client can establish multiple 
circuits, all spamming traffic, turning the exit nodes into a botnet. Tor's 
fundamental design can't protect against this, right? It's indistinguishable 
from, say, a massive amount of unidirectional SIP traffic. Normally, the TCP 
flow 
control would help, since a remote server dropping packets would cause the 
exit nodes to back off. However, UDP is far less gentle.
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