Me 109 mediocre roll rate at speed (3 Viewers)

[spicmart]

The roll rate of the 109 is said to not compare too well to other fighters of similar weight and dimensions such as the La-7 or Yak-9/3. Even the Spitfire with its much larger wing outrolls the 109 in many flight regimes.
Apart from a single-spar construction, large wing cutouts for landing gear, radiators and flaps, another cause of this is apparently that the 109 wing (from the F-version onwards) has a relatively large tip so that the aileron does not extend to the end of the wing.
Might it have been possible to rectify this flaw, at least partly, by extending the aileron further as seen in the sketch?
What do you think?

Pardon the amateurish sketch.

 

[PAT303]

Winkle Brown talked about this in one of his books, after flying a captured 109 during the BoB he mentioned the controls stiffened up to the point of being locked above 400mph.