The idea is to have a machine behind a research wall of some kind (ideally the same one as telepads) that does not spawn roundstart (so people who love abusing teleportation can still have their fun) but at the same time can an engineer or engi borg who hate fun (and being maxcapped/armory looted/etc from total safety) and/or who wants to upgrade brig in and different locations in a significant way. As well, the better parts you put into the machine, the longer the range is, and also perhaps the speed it starts up and stops running.
But at the same time, this machine does not come without its drawbacks (unless you are immobile anyways). As something that blocks all forms of teleportation, it'd disable a captain's ability to escape within its radius with a telepad, and would disable bluespace crystal crushing into or out of the aura, prevent the portals from spawning from the bluespace seeing trauma, prevent friendly telepads from doing anything to perhaps save you from death, it would teleport hiero club users right outside of its radius if its the blink function and stop hiero recall entirely and its blink function inside the radius. As well, it is power reliant (and odds are, will probably be a big ass power drain for what it's doing), and in order to prevent cheesing it, it would have to take a significant amount of time to start and a significant amount of time to stop working, similar to the gravity generator. If it loses power (the apc is turned off or runs out, etc) it would probably break entirely while also requiring a significant amount of time to slow down and stop spinning. As well, you can always try getting around it if it's not placed properly by teleporting in and out right outside of its range, so it's no easy win button here.
As for the sprite, it'd probably involve some kind of spinning thing on top and perhaps a light aura of some kind to signify its range clearly to viewers. It would probably have a wire setup in it, and have an AI control wire alongside something else if someone feels like it.
For its effects, it could probably act as a replacement for the band-aid anti-teleportation of the luxury shuttle, and act as a in-universe reasonable explanation for its anti-teleportness. It would allow defensive minded thinkers the capability to utilize counterplay against telepads and other forms of teleportation in an attempt to defend areas, while offering counter-counterplay in the form of abusing the areas it may not cover to get the job done and, if its a perfect coverage, act as a trap for captains/bluespace crystal (ab)users/xenobiology teleporters/cultists/etc. that prevents escaping with teleports in the area.
