let me vote agains any and all network / services related plugins,
if you people would be so kind as to read about zentyl small buisyness server, and its development you would like i did come to the final conclusion that its just not gonna work...
as it is OMV is a storage solution, and storage could go a long way, from file storage services like ftp, nfs iscsi and cifs/smb to if you must mailstore systems backup solutions or databases....
thats all fine and well and stuf...
but what would happen once you include irc and other comunications, would a voip pbx be next and after that a groupware a a pdc, (primary domain controller).
or what about dnsmasq, are you going to offer gateway services routing and firewalling Intrusion prevention.
next time you look youl be like zentyal, jack of al trades, good at nothing, hell to maintain and on your way to... abandonment by your entire community...
so whatever it its you do, stop at where storage is no longer important. and let other machines with other fine products do what they are meant for, so let pfsence for example to the lan management for you, its well-equiped for firewalling gateway access, and vpn services...