I would be interested in seeing an expanded list of psionic abilities be an option at character creation.
Some ideas of powers I had thought of are as follows:
Teleportation
Precognition
Psychometry
Clairovoyance
Telekinetic Fields
Electrokinesis
Astral Projection
Gravity Control or Levitation
Invisibility
Phasing
Shielding
Environmental Control
Transmutation
I had a hard time with psionics in the game. I originally had it in the Player's Handbook and wanted it to be a regular part of default game play rather than optional content pushed to the Referee's Handbook. But too many of my first round playtesters didn't like it - basically wanted the game to be an expanded new incarnation of Star Frontiers, so I ended up caving and pushing it to the Ref's book and didn't expand it further. As it is, you can play a jedi - like character on a very light level. But you're right, expanded content would be fantastic and really make the psion an enviable character concept.