JavaScript for Automation Cannot Use Scripting Addition Commands

Question

Attempting to recreate the example script for Messages called "Speak Events" with the new JavaScript for Automation in Yosemite, I found that it is impossible to use any scripting addition commands. For example:
Messages = Application.currentApplication()
Messages.includeStandardAdditions = true
function messageReceived(m, e) {
     Messages.say(m)
I have removed all the other (annoyingly) necessary function overrides for brevity. Similar AppleScript code functions just fine, but this will result in a privilege error because the system wrongly categorizes it as being sent cross-application. Is there any estimate on a bug fix for this?
I've tried everything I can think of to work around this issue, even adding /usr/bin/osascript to the Security & Privacy Accessibility listing ("Allow the apps below to control your computer") which is not possible without editing the SQLite DB.
The documentation included in Script Editor is also woefully inadequate, lacking a readable listing of what exactly is being passed into the handler function. How can I translate an AppleScript line like "received theMessage from theBuddy for theChat with eventDescription" into a reasonable function signature for JavaScript?

Answer 1

It is a big SDK and to learn its features requires a lot of reading. But to start with I guess I should start with "Introduction to SDK".
Since you want to control Acrobat from another application you should consider this under "Interapplication communication". You will be using OLE/COM.