That's steriotypical . . . last archer I played had +42 jump at 5th level, and could REALLY use it to their advantage. But whatever, here are the modifications:
Drop the class skill Jump, Tumble, Hide, Move Silently, Swim, decrease skills/level to 2.
Add +1 manifester level at levels 1, 4, 7, 10.
Make Psionic Arrow go up at every odd level.
And isn't using Fell Shot/Psionic Shot and stuff a free action anyway? Once per attack? correct me if I'm wrong . . .