UDP trafic problem

Am using RouterOS on PC with 2 NICs: one ‘Public’ (internet connection) and 1 ‘Local’ for LAN.
http://www.mikrotik.com/testdocs/ros/2.9/root/queue_content.php#6.54.6.3 (PCQ)
and this;

/ ip firewall nat add chain=src-nat src-address=192.168.2.0/24 out-interface=Public action=masquerade 
/ip dns set allow-remote-requests=yes action=masquerade
/ip firewall filter add chain=input protocol=tcp  tcp-flags=syn connection=6,32

For TCP connection limit works perfect…
I need to limit UDP to about 5 connections or to 6KB/s is this possible and how?

Thanks