Hi datastream,
Unfortunately, there is no "auto" button on the output level of Punctuate. The problem is that the amount of gain or gain reduction added is totally based on the input signal. For instance, one set of settings might add a ton of gain to a drum loop, but do nothing for a synth pad, so the plug-in has no way to determine what the compensation amount would be before hand.
Also, just FYI, in practice I'm usually running Punctuate into Saturate, because it can give you that big spike on the transient, which often sounds good clipped, and the clipping helps maintain the dynamics.
Dan