ttfautohint version 0.9.12 now does 'Stem Width Handling'
I am testing and posting screenshots at
Feedback welcome. 'Ayes' to the left, 'Nayes' to the right !
Below is Dalton Maag's Ubuntu Font, top original manually hinted, lower shot is same font auto-instructed with ttfautohint. Magnification is x800, x400, and actual size 13px. Pleas note the better 'eth' on the lower screenshot.