Operation: You would input coordinates for the teleport target, and there would be a drift of anywhere between + and -10 to adjust for. So if you put in 0,0, it could be anywhere from -10,-10 to 10,10.
Upgrading: Adding bluespace crystals would increase the range of the device up and up, emagging it OR SOME OTHER THING TO YET BE DECIDED would allow it to bypass the Bluespace Blockers that are specified in the next section
Limits: Bluespace Blockers would be in every secure area including AI core, AI uploads, Armory, MAYBE the Bridge, and MAYBE parts of engineering. Additionally, if you put in coords that did not exist or did not make sense, a shitload of monsters/radiation/BULLSHIT would appear on the pad so it is not without risk. Also, every 10 or so teleports the drift would change and you would have to figure it out again. this would be signified by the telepad fizzing and/or emitting sparks.
Other z-levels: Certain z-levels would be blocked obviously like Centcomm and gateway but other areas would be readily open, perhaps there would even be special telescience only z-levels (dunno if this is possible)