Historically, TCP Reno superceded TCP Tahoe. Reno differs from Tahoe in that the it ACKs every other packet and uses the Fast Recovery mechanism. The arguments used with rtcp are identical to those used with btcp arguments.
-tcpAcknow -tcpSlowstart=<integer> -tcpTimer=<integer> -tcpTimerAuto -tcpTrace=<integer>[:<integer>]
See Section 3.5.3 for information on these options.