Valet mode safe for building boost?

[SS2win]

In my search for a better 60 foot time I'm looking for ways to build boost. From the tutorial
The Valet mode RPM limiting uses fuel cut-off to limit the engine RPM, it does not use spark cut. It is not recommended you hold the engine on the RPM fuel cut for very long as the engine can run lean and damage the engine itself and/or catalytic converters, use it sensibly. Is anyone using this to build boost off the line? How long is too long?

[SS2win]

well I guess tha silence means I get to test it and let everyone kno...

[ringram]

Its a switchable RPM limiter which will cut fuel.
I dont know why you would want to use this on a FI engine, you could run too lean and shower yourself with engine parts.
I would think if you wanted to use it you would have to make it cut out at very low rpm on FI.

[SS2win]

Sorry I don't know everything about two steps but I would expect that if they cut the ignition that would be ok. Cutting the fuel sounded like a disaster to me and I wanted clarification. Guess this is another example that this software was written for people who "know how to tune" and "stupid" questions get avoided.