There was quite a lengthy thread on battle forms recently and how the design choice of having dead levels and not being able to cast was a sore spot for some so i thought i would test out a few feats i converted from 1e and see how others like them.
Natural Spell 1a Feat 12
Druid Witch Wizard Concentrate Metamagic
With great concentration, you have learned to substitute various noises and gestures for the normal verbal and somatic components of a spell while in a polymorphed state. Directly after you use this action, you may cast a cantrip or a spell that is at least 3 levels lower than the highest level spell slot you have while in a battle form.
You can also use any material components or focuses you possess, even if such items are melded within your current form. This feat does not permit the use of magic items while you are in a form that could not ordinarily use them, and you do not gain the ability to speak while in the battle form.
Energized Form Feat 8
Druid Sorcerer Witch Wizard Transmutation
You have learned how to mix your transformation into lesser creatures with the elemental planes to make them more powerful. When you cast a spell that grants a battle form in a spell slot that has no heightened option, choose one of the following energy types: acid, cold, electricity, or fire. Your form gains resistance 10 to that energy type. Also, one of your unarmed melee attacks deals an additional 1d6 points of damage of the chosen energy type. If you choose a battle form that already has energy resistance of the same type you choose, it increases by 5 instead. If you choose a battle form that deals damage of the same energy type you choose, increase the energy damage you deal by one die size (1d6 becomes 1d8, and so on).
The battle form also gains an extra +1 bonus to AC, +2 to temporary HP, +2 to attacks, damage and skill modifiers granted by the form for each spell level higher than the latest heightened option available to you.