I wanted to resurrect this post because it's been 2 years and 11 months without any sign of better documentation. "Customizing Locators in ArcGIS 10" still claims that Noise Characters are not yet implemented. Better documentation for this is a must-have. As far as I can see, there has been no new documentation or revisions of existing documentation for nearly 4 years (the white paper is dated Nov 2010). That would be fine if the system hadn't changed, but it's obvious it has. Those of us using custom datasets or non-US address formats are basically rooting around in the dark, taking guesses at what various things do.
Having to edit the locator styles clients needs on regular basis it would be great to have a better (or at least) updated reference document.
Also, edits that work fine in one version of ArcGIS, do not always work in other versions. There is no documentation at all about this.