I know that doing it from the nick list, it does +v them one at a time.
But I do believe that if you manually did /mode +vvvvv Nick1 Nick2 Nick3 Nick4 Nick5 , it should work.
But to do it with a script, its a little more tricky, as you need to loop through all the nicks
in the channel, and check if they are opped/voiced, and if not, voice them.
The one to use would be the $nick(#channel,N) identifier.
Its all in help under identifiers.