I got an answer for this by Kevin Crawford on Google+:
Psychic aliens might use conventional psionic rules, or they might just have a trick or two they can do whenever they feel like it as an evolved natural quality. Non-sentient animals are unlikely to have more than one or two closely-related abilities, while intelligent users might have more breadth. With regard to feral psychics, they can indeed use any of their known powers as often as they want, at the usual once-per-round limit. Ferals might develop entirely new powers based on their own particular lunacies or obsessions, or might learn more standard powers the longer they're left unchecked.
_________________We are but a tiny candle flickering against the darkness of our times.
Stellagama Publishing - Visit our Blog, Den of the Lizard King