multiple entries for class/realm fields in spell lists

There are a number of professions that use spell lists from other professions but the spell list 'Class' field only allows one entry. It would be great to allow multiple class entries in the field. This way you don't have to copy an entire spell list just so you can change the class.

The same can be said for the 'Realm' field as well in the case of a profession that has multiple Realms, like the Beastmaster and Warrior Mage professions.