There were long discussions about this during the Beta period, both pro and con from the users' perspective. IIRC, the one time an FDEV posted about it, they said a padlock view was considered, but not included. They said it was because it would be too difficult to balance as an advantage in combat, compared to the other view systems people use like TrackIR and the Rift. That comment is buried somewhere in the forum archive section on Feature suggestions.
Most of us who feel the need for this kind of thing are already using TrackIR or the Rift to keep eyeballs on target. Both methods are very well supported in the game, which may be another reason why they didn't feel the need for padlock view. Also, given the limited canopy view area in all the ships in the game, a head-tracker is better for quickly glancing down to the scanner for situational awareness in combat (i.e. seeing who is behind you), compared to a padlock view system that tends to lead to target fixation.