Since the last git build, you can do search like:
artist=eric clapton album=unplugged
It is still tokenized. so artist=eric clapton matches not only the artist eric clapton but also clapton, eric.
You can stop tokenizing still in the same way: artist=(eric clapton).
I will add this to the normal search too:
Offcourse a screenshot:
Next release is going to be treat.
p.s. latest windows build now here