Slyde allow setting values for options that were not intended by mojang (for example: ridiculous fov effects or increased gamma)
This will (obviously) break things if you are not careful (for example: changing the target resolution outside its slider will cause a crash)
Credits
Slyde modifies options code to properly store values in the extended range. The implementation for this was based on FiveOneFourOneEight by apple502j.Slyde optionally locks the cursor on sliders to work around screen edges limiting possible values on Windows. This was inspired by SlydeMore by No-Eul.