PFixer runs as a "background" program and binds itself to Lightroom. It gives you two things: customized keyboard shortcuts and hardware control.

Keyboard Shortcuts:
It allows you to completely customize Lightrooms shortcuts and allows you to assign keys to things that even Lightroom doesn't allow, such as each of the individual sliders. You can also assign keyboard shortcuts to any of the Develop Presets you have. You can use any of the keys on any keyboard you want.

PFixer is not a preset system, but it does allow you to assign keyboard shortcuts to any preset you already have.

Hardware Control:
The PFixer Panel allows you to control Lightroom with physical sliders, buttons and knobs, which is faster and more intuitive than a keyboard and mouse. It will also work with any other MIDI control surface hardware.