I just tip my seat forward. Haven't had a problem yet. Never leave my sling far from sight. Don't mind if people want to look and I will invite people to sit in it. But unfortunately some people cross the line. I will probley never have an alarm. But I can't confirm or deny that there may be a tracking device located somewhere on the vehicle. I figure if they want it bad enough alarm or not there going to get it. Just think about when you walk out of a store and hear 2 or 3 car alarms going off. I don't give it a second look. The worst thing that had happened to me in regards to people over stepping their boundaries was I came out of target and a girl was dropped over the side 1 leg in 1 out and her girlfriend taking a pic. Was not really happy and let them know it. I did have the seat tipped and probly was the only reason she wasn't in it. 
Yep, I do know we've had a rather extensive discussion in several Slingshot Facebook groups about folks "helping themselves" to "invade" Slingshots for pics, plain curiosity, etc. The alarm - especially the perimeter feature - is just one of several methods folks use to deter and/or prevent it. Seats forward, doorway barriers, signs (at least for those intruders who can actually read, and who may actually COMPLY), alarms, seatbelt placement, close vigilance, and many other suggestions seem to be used by many folks.
Your statement "Don't mind if people want to look and I will invite people to sit in it. But unfortunately some people cross the line" is probably almost universal among Slingshot owners. Personally, most of my friends who have Slingshots are either former (like myself, thanks to disability) or also-current bikers (mostly Harleys) and the nicest people in the world - but also VERY protective of their highly-admired rides, AND who don't hesitate to "communicate with strained patience" when others do rather stupid things to them.
