Feats like Acrobatic and Alertness may be better rewritten so that the character is trained in the skills rather than gaining a bonus to checks. After all, there are some checks you can't make untrained.
Acrobatic
"You are skilled at leaping, jumping, and climbing"
Benefit: You gain a bonus skill rank in Acrobatics and Fly. Acrobatics and Fly are always class skills for you.
In addition, you gain a +1 bonus to checks made with either skill for every 5 ranks you have in it.
As written, even if you already have ranks in the skill, the bonus is still useful without being overpowered.
This should help quell the "rank hunger" of 2 + Int mod. skill rank classes.
