You can restrict groups though. If those ranks were in a group that could not vote that would work.
The auto groups extension can move people from group to group based on post count (if you mean that sort of rank).
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To be clear ranks are purely ornamental. You could give someone the admin rank but they are not an admin. You can add someone to admin group without giving them the admin rank and they have admin privilege's.
That said when you add someone to group like the admin group you typically make it their default rank. You can make a group with poll privilege's and add people to that group and use a default rank for that group. Set the poll privilege's to registered users to no.
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Couldn't find the proper place to look. Been years since i've had to dig into the finer things of phpbb. With your guidance it looks like things are already set the way i want them by default? Registered can (change) vote but can't create them. Mods and above can do the whole shabang. Solved i guess
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