Continuity is great. Calling or taking calls from your Mac is even more awesome. However, you were only able to call a contact from your computer if you look it up with Spotlight.
I am an Alfred user. Even with the Spotlight revamp in OS X Yosemite, Alfred is still the best productivity tool when it comes to launchers and workflows on the Mac.
Calling a contact on my Mac was pretty cumbersome. Until today. I had to search for it with Alfred, hit ENTER to reveal the details, arrow down to select the phone number, Hit ENTER again to copy that number and then copy it into Continuity Keypad.