I apologize for my request, because one of the features that I requested actually changes the gameplay. I am talking about the "Toggle Run" control.
I wondered why Looking Glass did not add a way that allows the player to run in other directions except forwards, this is also true for Thief 2. But Thief 2 has many bug fixes and improvements not present in Thief 1 (e.g. you can not bunny hop, you have a control for the 'Speed Potion', etc) so they could not have just missed this. I came to the conclusion, that they did not allow the player to run in any other direction except forwards because that is an intentional constraint.
I can only speculate why they choose to impose this intentional constraint. I believe that this is so because in real life you can not truly run sideways or backwards. I have seen a person run backwards once in my entire life and his speed was significantly slower compared to when running forwards.
All that being said, I still believe that a "Run Toggle" should be added, but it should only toggle the speed of Garret's forward movement.
Again I apologize for not noticing this gameplay-changing perversion.