I'm far from an expert, but from my baby boomkin's spellbook, the only ability that requires Moonkin Form is a passive.
Healing spells can't be cast while shape-shifted, but there is a glyph that removes that restriction on most, if not all, of them, and I'd think you'd still want to have heals on a hotbar somewhere anyway, since they can still be cast (they just put you in caster form).
Anyway, with a toggle setting, no reason everyone can't be happy...
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