Guy, I've used the adaptive WA filter and while it'll do the job, it requires a lot of hand holding, setting alignment guides for things that should be straight. They are basic adjustment tools and don't offer more than 3 points of adjustment for any given straight element so moustache correction would require a few adjustment lines, with tweaking for each. A lens correction preset would be far more efficient. It looks like a mesh can be generated and saved if one high quality correction were built. Dropping an image into PTgui, I was able to build a moustache correction preset in a few minutes and output what some (i.e., me) may feel is a better quality image using sinc 256 interpolation as opposed to PS's bicubic.
Dave, I'm a die hard 14-24 believer and have found for the times it's critical, the new Fotodiox filter adapter is a good solution. It's filter size, at least for now, means using their filters, which are not the best but are useable.