There are a few reasons we stick to capitalization for the formal you. Teachers generally do the same when they teach Italian and Accademia della Crusca supports it. The way the program is set up would make it difficult to distinguish whether the pronoun in question is a female friend or a male you respect. Imagine having finished the first few lessons and all of a sudden you realize she means something else!
please check this one, jenny: http://forum.wordreference.com/showthread.php?t=231131&langid=20