The Debug Menu can be accessed by pressing "Shift + b" on the Main Menu.
The "Input Manager" input box can have the following inputs passed to it to achieve the following results:
"Sen:(X)" - Changes mouse sensitivity.
Replace (X) with an integer. Default value for (X) seems to be around 3. This value is saved across play sessions. Decimal values will not work, and 0 is not accepted as a valid input, but negative integers are. Inputting a negative integer will reverse the mouse input.
Rough guide to values Sen:1 - Low Sensitivity Sen:3 - Medium Sensitivity Sen:5 - High Sensitivity Sen:7 - Very High Sensitivity Sen:10 - Extreme Sensitivity Sen:100 - Essentially Unplayable Sen:10000 - Definitely Unplayable
(At the time of writing, there are no other known uses for the Input Manager currently known).
IL timing now starts upon level fade in, rather than upon pressing "Continue" at the main menu. The rules for when timing ends for each level will remain the same.
This change was made for a variety of reasons, it removes any loading time from IL runs, it allows ILs to be submitted from full game