For OS X 10.10, if after upgrade WJoy stop work:
remove WJoy (and remove it from trash)
remove all Wiimotes from system bluetooth settings
install WJoy (from dmg)
start it
select "One Button Click Option"
try connect wiimotes
Crash (on Wiimote disconnections) i'll fix later.
For mapping Wiimote buttons to keyboard, you can use this utilities:
http://justintime4java.weebly.com/wiicontroll.html - WiiControll (Justin Wong)
http://abstractable.net/enjoy/ - Enjoy (Sam McCall)
One-Button-Click-Connection option: enable this option, and for the first time try to connect Wiimote or Wii U Pro Controller with old method (1 + 2 buttons or red sync button). After what, WJoy (and OS X) will remember this device, and if you press any button on disconnected controller, it's connect to your mac and WJoy (if it started).
WARNING!!! If you Wii Remote connect to WJoy, and device disconnect immediatelly - use sync button (http://wiibrew.org/wiki/Wiimote#Bluetooth_Communication). Thansk to Miguel Pontes for this hint. :)
WARNING2!!! On 10.5, if after WJoy connecting to wiimote all system are freezes, try to reboot computer, and after rebooting: select WJoy in Finder, open context menu, select item "Get Info", and set "Open in 32 Bit Mode". It's bug in bluetooth stack in 10.5 - 64-bit applications can't use bluetooth.
New in version 0.7.1:
fixes for new OS X 10.9
added new One-Button-Click-Connection
other fixes :)