It is a great suggestion. We have been recommending the experts in their fields, be it panel beating (denting) electricians and most important of all the mechanics, when fellow vee dubbers have asked for our input.
Our website too has a section where individual VW owners can leave feedback for any VW tech person. We would only monitor the language to keep the comments civil for all visitors to the page. (the website is currently down after an attack by Serbian hackers who defaced the front page and a lot more. We hope to have a simple version of it up at the earliest)
The issue with giving any one (or more) mechanics, electricians or dentors an official status is that individual experiences vary. e.g one very popular panel beater made a complete mess of my car while there is an army of satisfied customers who would not hear a negative word against him. I suggest the best way to go about would be to post individual recommendations and feedback. You, for example, would rate your mechanic very high and recommend everyone in Karachi to go see him if they wanted their cars fixed. (wouldn't you?)
I would however recommend that individuals not fly off the handle at the first bad experience. VW experts are a dying breed ..an endangered specie, so please provide feedback with care.
While you get work done on your car, its best to observe with full attention. You may find that the same work could have been performed by yourself or with the help of your younger brother at home.
Sooner rather than later, we'll have to rely on our own skills to keep our beloved bugs alive. Better start preparing.