[Openvpn-devel] --local, --lport and --bind

[Dash Four]

Currently, openvpn only accepts "bind" if both "lport" and "local" 
options are specified. Why?

Why can't I specify "local" to instruct openvpn to bind to a specific IP 
address or interface and leave it to decide a (random) port it binds to 
in the same way in which the "nobind" option currently functions? What 
is the reason for this unnecessary restriction?