As a general surgery chief resident who will be starting a traditional plastic surgery training program next July, I believe that surgical talent as described by letters of recommendation, or in telephone conversations with a PD are important. Precision is important to plastic surgeons. However, most letter writers will overhype you somewhat, and a PD wants his/her trainees to do as well as possible in the match so they probably overhype you as well.
In the integrated/combined match I would guess that surgical ability is not a factor at all since medical students have no surgical ability.
I would say that students/residents interested in plastic surgery are in general more pre-occupied with the fine details of an operation (and the way the scar looks) than other specialties. This preoccupation with precision may lend itself to the development of superior technical ability. Though, I'm only speculating.
At this time in my development, I think that technical expertise is the easiest part of learning to be an excellent surgeon. The more taxing, and at times painful, things to learn are judgement, management, and administrative skills.