WowAce

I believe it would be a great feature if you could add a zone based item filtering to reduce congestion. That is an option to set items (by user) to only show in various (for example current) zone.
For example one could set to always show "Apexis Shard" but only in "Blade's Edge Mountains" as it is the only place it can be gathered or used.
I dont expect you (and it shouldn't even be viable) to pre set all quest items. Most quest items are only used once. But for the repeatable and daily quest such a feature would be very useful. You can just make it a user set option, so you dont have to pre set anything.
For items that are used in multiple zones then user can just leave those open. But a lot of daily items are only usable/gathered in one zone.

About the spell/mount thing. You could extend the item (spell) ID to cover things like drake mount in Oculus and rockets on ICC Gunship (and similar stuff) these are not quest items, but with your fine implementation of key binding to last used item (which I really like) then when one is in oculus and get his/her drake mount. It would show on the bar and after first use the usual key binding will apply (I personally use "x"). Why I mention this, separately is that for example the rocket lunch (jump) on ICC gunship does not stay in you bag as an item, but rather it becomes a temporary spell /skill, so now that addon will not detect it.

Please provide any additional information below.

I really love this addon. its the best in its class, please keep the updates rolling.

Well, it is a maybe on the zone filtering. First of all i have to improve the config UI for the current filtering. I may add zones if it is not too hard to make the configuration for it.

Hmm, maybe on the spell/mount part.