Hey Dylan and welcome to the forums!
You’re absolutely correct that seating charts and assignments are not currently supported in Event Tickets Plus. It’s a feature request that has been trending up lately and something we’re certainly interested in, though it’s not on our roadmap yet.
I think the simplest way to accomplish seating arrangements is to use Eventbrite.com and our Eventbrite Tickets add-on instead of Event Tickets Plus. Eventbrite has done a wonderful job integrating seating options into the ticket checkout process in a way that has not been done well in WordPress yet, so that might be your best bet for now.
I see you are still well within our refund policy — if you are interested in returning Event Tickets Plus in exchange for Eventbrite Tickets, let me know and I’d be happy to help make that happen.
Cheers,
Geoff