Yup. I worked with guest conductors in university who used non-440 tuning. It actually made a difference- people played differently and the sound was significantly different.
Interesting. After reading your post, I did some more reading and found that violin players, especially soloists, liked the higher tuning because it made the instrument sound more brilliant. The same was said of the sound of the orchestra overall.
But vocalists didn't like the higher tuning, saying that not only was it more difficult, but that it changed the sound of a particular piece of music away from how it was originally written (in the case of 18th and 19th century opera pieces).