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rdr and pass out

I wish to perform load sharing between some webservers.
So i have this in pf.conf
I also whish to normalize traffic:
set state-policy if-bound
scrub on $ext_if all fragment reassemble reassemble tcp random-id
web_servers = "{,, }"
rdr on $ext_if proto tcp from any to any port 80 -> $web_servers \
    round-robin sticky-address
However, with the rdr rule do i also need to ass a passout rule
for the ext_if (i also wish to use modulate state)?
Would it also possible to assign a virtual address and direct any traffic
to that ip on port 80 to the web_servers?