So, in regards to the Phobos add feral mod, is there no way to become feral yourself?
There are two ways to make your character a feral. You can, as BaloneyAmone mentioned, manually edit your save file, or have the mod change your character's body as it does with other NPCs.
If you decide to use the second way, here's what you have to do:
1. Prepare your character. For the transformation to be successful, it is enough to have 1 body part of the desired morph (e.g. eyes) and be defined by the game as a morph. Tested it on a human with wolf eyes (Lesser wolf-morph), transformation was successful. I'm not sure if body parts of other morphs will interfere with transformation (probably not), but it's better to avoid uncharacteristic parts of the desired species.
2. Save the game (preferably in a new slot, in case you suddenly want to go back to the old character) and close the game.
3. Make a backup copy of add_ferals.xml made by Phobos.
4. Replace add_ferals.xml in the game folder with my file.
5. Start the game and load the save with the prepared character. After loading the character should become a feral.
6. Save the game and close Lilith's throne.
7. Return a backup copy of the original mod to the game folder.