I just added a library of Keyboard Maestro macros for OmniFocus to my Learn OmniFocus site.
Macros include a global macro for launching Quick Entry even if OmniFocus isn’t running and a series of macros to quickly jump to a specific field (e.g., ⌥D for Due and ⌥U for Defer Until); these will work even if you’re currently editing another field. I personally use all of these macros regularly and find they add ease and efficiency to OmniFocus.
I hope you find these macros helpful! I plan to add more macros to this library over time. Feedback and requests are welcome and appreciated.