This question was posted in response to the following article: http://help.adobe.com/en_US/ColdFusionBuilder/Using/WS0ef8c004658c1089-1a5748a01250bd15dfa -8000.html
To use context-sensitive Help on Mac OS, set a keyboard shortcut to the Dynamic Help command. To specify a keyboard shortcut for the Dynamic Help command, do the following:
Select Adobe ColdFusion Builder > Preferences.
In the tree view, select General > Keys.
Select the Dynamic Help command.
Press the key binding combination that you want to set. For example, to enter CtrlShift1, press and hold the keys Ctrl and Shift and then press 1. A plus sign between the keys indicates that you must press the keys in succession.
This is what you have mentioned above, but it's not working like the functionality as we get in windows with F1 short key.