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One way to make the Signature Skill and Rogue's Edge more enticing as a feature is to have choices.
Sure you have the choice of what skill you want to focus in, but the problem is that some choices at certain ranks just don't appeal to your character.
It could even come in the way of a new usage of a skill, similar to Occult Skill Unlocks or how Spymaster's Handbook added new uses of Skills.
E.g.
Heal:
5 Ranks: The DC to provide First Aid is reduced by 5.
10 Ranks: When treating Diseases/Poisons, the competence bonus provided is increase by 2.
15 Ranks: Any Heal task which requires a duration longer than a standard action is halved.
20 Ranks: Healer's Kit uses are not consumed upon usage and you may perform Heal tasks without one at no penalty.
Diplomacy:
5 Ranks: Add 1.5 times your Charisma bonus to your Diplomacy check.
10 Ranks: When you use the Aid Another action, the bonus you provide is increased by 1.
15 Ranks: After a minute of knowing a humanoid, you can appeal to the humanoid (as Charm Person, but language-dependent), by attempting a Diplomacy check at a -20 penalty opposed by the humanoid's bluff. Treat your Ranks as the CL.
20 Ranks: You can draw the attention of a crowd (as the Bard's Fascinate Bardic Performance, except language-dependent) Treat your ranks as Bard levels for this.
Steath:
20 Ranks: Gain +1d6 Sneak Attack. This becomes +2d6 when the Enemy is unaware of you.