Skill increase rate is governed by GMSTs. There is no way to alter GMSTs in-game. They can only be set in the CS. (so, no toggling)
You can set the GMST for the type of skill it is grouped in (Major, Minor or Misc) but I don't believe you can choose one specific skill.
The GMSTs are: fMajorSkillBonus, fMinorSkillBonus, fMiscSkillBonus
The lower the value, the faster you gain skill points.
You're better off just using the EnableStatReviewMenu (or EnableRaceMenu) in the console, and just changing your Skill choices that way.