I hope to update the OpenVPN with the latest release in the 1.0.beta5 of ZeroShell that will be available this week. In any case the 1.0.beta6 that will be ready for the download in September will contain a new OpenVPN release. Zeroshell will use OpenVPN not only for lan-to-lan VPN, but for Road Warrior host-to-site VPN too. At moment host-to-lan VPN is only possible by using L2tp/IPSec protocols that is not so easy to configure in Windows XP and Linux.
Fulvio