Running an NA-T I've got high compression and have been told WI would be a good idea for a safe guard. Not having knock sensors I think the WI would be a good idea just as a safe guard, so tuning in a few extra BHP will only require a shut off device like you say, and a low-level sensor.
The AEM kit I was looking at, has a low level sensor output light and output signal, and the AEM boost controller I'm also looking at has the function to connect the two, shutting off the boost controller if the low-level WI sensor is activated. The units I am looking at seem to be able to talk to each other and forfill this requirement, so hoping I can use them together for that little bit extra.
NA-T's seem to knock around just below 400, very few people push the limits of the NA's with stock compression and boost, so by doing this hopefully I can play it safe and get the most out my engine.
I don't want lower compression at this time, as it will require bigger injectors and my gearbox will fail with a huge jump in power anyway, so a few extra BHP is all I'm after, if I can safe guard at the same time then even better.