Dry needling of the subescapularis myofascial trigger points related with surgery can improve the signs and symptoms of the shoulder:

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Dear Doohyung

Yes - changing the humeral retroversion helps, but the price may be a reduced external rotation which is often more limiting than a lack in internal rotation. If you have a patient that needs a RSA on the SECOND arm, i suggest to implant in 0° retroversion to allow for personal hygiene. 

Subscapularis reattachment will help internal rotation strength but not ROM. I do recommend to reattach but only if you can do without over-tensioning. The muscle excursion in RSA of the Rotator Cuff are bigger than in normal anatomy. Thus a tight SSC may limit external rotation. 

Hope that helps, refs. in the book of the last Paris International Shoulder Course

Although changing the retroversion might work, but this will reduce external rotation as mentioned also might jeopardise the mechanics and stability of the joint.