To have ChanServ voice certain users you could add them via the VOP command such as:

(+Voice): /msg ChanServ Vop <channel name> Add <nickname>
(-Voice): /msg ChanServ Vop <channel name> Del <nickname>

The person you want autovoiced must have a registered nickname.

Now whether or not ChanServ supports VOP on your network just type /msg ChanServ help or /Chanserv help for a list of commands at your disposal...