As much as fun as the cove is... There is somethings that don't make sense for druid spell restrictions in the cove.

Flame blade is one?

The other is creeping cold and Greater creeping cold.

Personally why don't you just unrestrict everything.

Melee don't really have restrictions but casters do. I think when you first opened cove it was understandable but really it would be more fun.

The other suggestion is maybe create cove instances of level. If I go in the cove on my lower lvl toon I'm always getting wiped by lvl 20 + monster and kinda makes it less fun. Could you make Instances of lvl like 1 to 5, 6 thru 10 of choice. So a lvl 7 can try a lvl 20 monster for better drops or to use as practice on over lvl mobs?