My suggestion is to have an application for a town owner to get a warp sign made wherever they want it to be. Like the warp signs at spawn, anyone should be able to use it. Maybe this could also be Tp+++ feature or something, but an application seems better.
So you know the warp signs that you click and they send you to a warp (like at spawn to take you to the shop.) My idea is that people could apply for one somewhere so people without TP could go to a certain warp.
Example of you have a shop at a certain warp you could apply to have a sign to that warp at your town so everyone could go visit the shop
Wouldn't this be the same as a portal app? +1! Warp signs are much more customisable are can be personal to specific users! This should definatly be added.