BOZ
Creature Cataloguer
1. actually, the 2E description does infer that the baku has mind thrust and psychic crush, and all of the defense modes - that's where the " MT,PsC/All" fits in.
we can add mental barrier and tower of iron will to the "baku sometimes have this" list to avoid overcrowding. 
2. first edition DMG.
I don't think you'll find them in the 2E Complete Psionic handbook, unless the names have been changed. Metamorphosis at will looks to be a fitting substitute for shape alteration, as long as it would allow a baku to change into, say, a human. I don't know that we have a good allegory for animal telepathy though, such as perhaps the speak with animals spell.
3.- 5. I agree that it is a tough call. I think the simplest solution would be to mimic the 1E description, throwing in some input from the 2E description. Thus, we would go with Psi-Like Abilities, which seems to be the standard nowadays anyway. Mostly, the 2E approach of assigning PSPs to psionic creatures has been abandoned in most cases. I think we will want to give the baku some powers at will, while limiting others.


2. first edition DMG.

3.- 5. I agree that it is a tough call. I think the simplest solution would be to mimic the 1E description, throwing in some input from the 2E description. Thus, we would go with Psi-Like Abilities, which seems to be the standard nowadays anyway. Mostly, the 2E approach of assigning PSPs to psionic creatures has been abandoned in most cases. I think we will want to give the baku some powers at will, while limiting others.