Molasses is a little program I made that lets you bind a key to a command that will change your mouse speed when it's held down. You can configure the new speed with the slider.
(If you set it to Caps Lock, the change will happen when it's toggled).
Useful for when you want to temporarily lower how sensitive your mouse movements are. PM me if you encounter any issues or have suggestions, although this was just a pet project and I'm probably not going to give it cupholders or anything.