PF and rtables (VRFs)

[Paketix]

i am using multiple rtables to separate traffic from different zones on my
openbsd 5.0 firewall
is there a way to limit pf states *per zone / rtable* so that a single zone
cannot eat up all states?
if a zone is able to fill up the state table this will be kind of a DOS 
other zones are no longer able to create new pf states
thank you
/paketix