pfSense

From the pfsense GUI:
Don't pull routes - Don't add or remove routes automatically. Instead pass routes to --route-up script using environmental variables.
If checked route-nopull in put in the configuration file.

Don't add/remove routes - This option effectively bars the server from adding routes to the client's routing table, however note that this option still allows the server to set the TCP/IP properties of the client's TUN/TAP interface.
If checked route-noexec in put in the configuration file.

The manpage for OpenVPN states:

--route-noexec
    Don't add or remove routes automatically. Instead pass routes to --route-up script using environmental variables. 
--route-nopull
    When used with --client or --pull, accept options pushed by server EXCEPT for routes and dhcp options like DNS servers.

    When used on the client, this option effectively bars the server from adding routes to the client's routing table, however note that this option still allows the server to set the TCP/IP properties of the client's TUN/TAP interface.