Or, how about a script to run after any webex update?plutil -replace LSUIElement -bool true /Applications/Webex/Cisco\ WebEx\ Meetings.app/Contents/Info.plist

The solution is to open the app in finder, right click Show Package Contents, and edit Info.plist with the text editor, switching the LSUIElement value to true!  

I'll be first one to admit, I created an account for the sole purpose to complain about the WebEx Meetings icon in the dock!