From what I remember reading, I think this what was deffinatetly on the cards, espesically now it is all computer based, the MOT tester enters any mods onto the computer presumablly and updates DVLA records.

I do not know the exact details of it / if its in place yet, but it was deffinately being considered.

Have a search on here for "DVLA" or something and you may find a thread which will shed more light on the subject.