Teleport from map side to opposite side

Basically the PCs are unable to leave the map, walking off one side brings you back in on the opposite side.  I have the teleport API and all pads are set up and linked.  Each pad is actually a long bar one square high x 32 squares wide to take up the side.  Placing a token onto the map and walking it along the pad does not trigger the teleport until I reach the middle of the token, but also I sometimes get a teleport when I am still a square away from the token?  I would get this if it only triggered at the pad centre, though that would seem contrary to the purpose, has anyone managed to set up a pad that is similar and had it be effective along the whole length?  I tried pads 9x9 and they seemed fine, but if I set up a pad as a 3x1 then it all starts going very odd

Nick Olivo did link to Github and an API by FinalFrog and at first that seemed to be OK (tested with 10x 1 pads) but once the pads were stepped up to 25 x 1 they also failed.  Not sure why and so can't continue.  Surely I am not the first DM to want to automate a large area teleport like this?

Just in case anyone also needs to throw their PCs about, FinalFrog did release an update: <a href="https://gist.githubusercontent.com/finalfrog/124f67ad84204546caf16fffd84115e4/raw/e11b9c1bf1f0a35e8f72b9f967fbb70b56d80801/MapTeleporters.js" rel="nofollow">https://gist.githubusercontent.com/finalfrog/124f67ad84204546caf16fffd84115e4/raw/e11b9c1bf1f0a35e8f72b9f967fbb70b56d80801/MapTeleporters.js</a> and that works a charm, tokens must be allocated to a player though, NPCs don't activate the teleport.&nbsp; It is quite old but it works, bit like my good self...