Not long after purchasing my 914 (in CA then, where car theft is rather more frequent than in most places), I studied my ignition and sought through the methods of hotwiring the car to discover the difficulty level, which I found to be quite satisfactorily difficult. I decided one would have to possess some intimate knowledge of this car to pull it off and actually be able to drive the thing away. And this was comforting, as neither of my door locks were functional at the time, doh!
The only theft deterrence I ever instituted since was a nifty metal finger bolted to my tail shifter and designed so that before exiting the car I could leave the gear shift in reverse and then reach under the car and swing the metal finger down over the end of the linkage to prevent the car from being shifted out of the reverse gear. Figured that would foil all but the most determined klepto.
I did, however (for my own personal use only, now), specially design a slim jim that reliably enabled entry into the driver's side in an easy ten seconds. Just left the door panel off so I could practice and devise the most appropriate shape for the tool--and no I won't say what it looks like.
But I still keep that thing hidden underneath the car (feel free to guess where?) and now simply laugh when those keys end up left in the ignition. Just keeps me in practice.
John, in