To all those people saying no to schemes for other classes, it seems that you're all hung up on the skills aspect. I kinda thought it wasn't needed to be said but that each class would have their own version of schemes and that they wouldn't exactly mirror rogue schemes.
The purpose of the rogue schemes is to add skills because they're a skill monkey class. The purpose of other, scheme-like, additions to classes would therefore be tailored to suit the class. For instance, a wizard 'school' would perhaps give one extra spell slot per level that can only be used for a spell of the school, and it comes at the cost of something else. A stance for a fighter might give the ability to make opportunity attacks against targets attacking allies or something.
No, we see those things as themes.
Schemes were purposely created to add skills to rogues.
I could see the same with Rangers, another skill class.
Rangers could choose a Favored Enemy and a Favored Enviroment and get skills from both.
Favored Enemy: Goblin
Perception +3
Insight +3
Sense Cheating: The ranger are immune to bonus damage granted advantage
Favored Enemy: Orc
Endurance +3
Intimidate +3
Fight by Sound: The ranger doesn't suffer a disadvantage on attacks due to poor illumination or darkness
Favored Enemy: Kobold
Find/Remove Traps +3
Open Locks +3
Mook Slayer: The ranger deals 1d6 bonus damage when outnumbered