to do with tcp utilities:

 - xor pads or some symmetric cipher
 - test ipv6 support properly
 - add command line helps for listentwo and connecttwo
 - add rate limit for listentwo and connecttwo
 - print timestamps for various events
 - logging
 - better access control
 - on-the-fly controlling and rate limiting
 - stats keeping in the listening process
 - '#' commented lines in multiplex file get lost on update
 - IPSec, P2P crypto bridge over untrusted networks in port forward tool
