Hi Jan,
As discussed over the Ask The Expert event, there is no way to setup a custom port for WAAS Netflow reporting:
WAVE-474-1(config)#flow monitor tcpstat-v1 host 1.1.1.1 ?
WAVE-474-1(config)#flow monitor tcpstat-v1 enable ?
WAVE-474-1(config)#
Regards,
Nicolas