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There is a Legacy version here.

PFS StandardForm Control [one-action] Feat 4

Druid Manipulate Spellshape 
Source Player Core pg. 130 2.0
Prerequisites Untamed Form

With additional care and effort, you can take on an alternate shape for a longer period of time. If your next action is to cast untamed form, the spell’s rank is 2 lower than normal (minimum 1st rank), but you can remain transformed for up to 1 hour or the listed duration (whichever is longer). You can still Dismiss untamed form as normal.

Form Control Leads To...

Perfect Form Control

Traits

Manipulate:

You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can’t perform actions with this trait. Manipulate actions often trigger reactions.

Spellshape:

Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. The benefit is also lost if your turn ends before you cast the spell. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.