Is it possible to use global hotkey to add tasks on MAC?
unfortunately, it's not possible right now, but we may consider adding such feature in the future.
You're welcome to add a request to our Votebox:
We've released a new version of our Mac app with bug fixes and new features such as quick task adding. Please install the latest version from http://todoist.com/mac and let us know if it fixes any issues you've been experiencing with the old version.