For a future update i think acual ticket booths should be added or/and a ticket self service item so you can build a building so guests can purchase tickets on the way in instead of the path barriers.
Yeah, this would be nice. I've played around with building booths before, but without a person standing in them they don't look quite right (although I've been known to cheat somewhat by putting an information centre right beside the turnstile and just pretending...)