I've finally started configuring my 0.9 installation, and I'm finding the new album artist parsing frustrating. I've always used the existence of the ALBUM ARTIST field to indicate that ARTIST varies from the album default for that track. Long story short, [%album artist%] returns %artist% even when ALBUM ARTIST doesn't exist, and requires me to drop back to $if($not($strcmp($meta(album artist),)),%album artist%) for the same effect. This is rather frustrating and unintuitive.
I'm aware that the developers are leery of allowing users to alter the translation layer or whatever you want to call the code that does this behind the scenes. This is rather annoying though. I would really like to be able to alter elements of the translation layer. It would allow me to do things that I've wanted to do for a while, like pull version information (like remix name) out of TITLE for searching and organizational purposes, while still allowing simply using %title% to refer to the whole thing.
Again, it's not a huge deal, nor a huge request, I just find the 0.9 method frustrating and unintuitive for the ALBUM ARTIST special case. It would be very handy if there was some way to give the user control of this translation layer, especially when it makes special-case headaches like this.