Ive been doing some thinking, i may be wrong but maybe its not that STI's dont work with MTB derailleurs maybe its just the swing style, now thinking back the only front derailleurs i had problems with where bottom swing which are primarily MTB but i have seen some on roadies, but the top swing seem to work just fine. Wait just as i was writing that my brain start working more oh wait nope i confused my self further, ill get back on that thought later when i get off work, I have an idea