I'm just referring to drag 'n drop.. the only odd thing is that it should be dragged to the actual track envelope rather than the parameter env
but for getting Automation Items to your edit cursor from the Media Explorer, you could do something like
Code:
mediaEx = reaper.OpenMediaExplorer("C:/path/saw.ReaperAutoItem", false)
reaper.JS_Window_OnCommand(mediaEx, 1013)
and make a script for each type I suppose..