The idea of teleporting with no items is nice but seems a bit far fetched, so what if you had a maximum amount of items you can teleport with (say, your hotbar as an example) and if somebody has too many items then have a message appear in chat saying, “that’s too much luggage to be carrying around without your ship, matey” because after all, this is a pirate themed minecraft server with little relevance to pirates at all.

However, I think having a maximum distance you can teleport would be nicer and maybe even teleport-less zones. You can expand on this idea and have certain limits per rank, maybe a longer or a shorter range as you go up the ranks, but do bear in mind that you want people to rank up.