Oblivion

 
Slowing 0 fatigue

This is just a porting of the "0 speed at 0 fatigue" concept from Necessities of Morrowind.

Running at 0 fatigue sets your base speed attribute to 0, a not so hard, still noticeable penalty.

 

 

 

Tempus Fugit

Adds a magic item, allowing the player to change the game time/real time factor at will. Technically speaking, it is just an in-game interface (admittedly simpler than "set timescale to xx" console command for the common user) to modify global float TimeScale.