Needs review
Source: Encyclopedia Arcane: Dragon Magic

Description: You keep your physical attributes while in an alternate form.

Prerequisites: Great Fortitude

When the character transforms into an alternate form that is weaker than his natural form, he keeps a Strength and a Dexterity score equal or lower than his originals. The character chooses what score he wants to have in his alternate form, provided that it does not exceed his original score.

Creatures with more than one ‘natural’ form such as lycanthropes, can choose their Strength or Dexterity score from among all their forms. If transformed against his will, like with a polymorph other spell, the character can mage a second Fortitude save (DC 15) to choose his Strength and Dexterity scores from those of his new and his original form, plus he gets to keep his mental scores (Intelligence, Wisdom and Charisma) if the new form’s are lower.

Special

Dragons and half-dragons can get this feat without fulfilling the prerequisites.

Normal

Polymorphed creatures assume the physical ability scores of the new form, regardless if it is better or worse. Creatures polymorphed against their will may lose their mental scores and forget their original identity.