help needed

context :
trying to send event to an app in the background ( safari ).
Started from this example : http://www.cocoabuilder.com/archive/cocoa/234233-send-click-to-window.html
and this 
http://src.chromium.org/svn/trunk/src/chrome/browser/automation/ui_controls_mac.mm


the event generation is in
https://github.com/freynaud/MacOSNativeEvent/blob/master/MacOSNativeEvent/EventFactory.m
The glue around is to launch safari, find the PID, the windowID.


Problems :
issue 1 : if the mouseDown event is modifier is just 0
modifierFlags:0 , nothing happens.
modifierFlags:0 | NSCommandKeyMask works, but that's a Command + click. I want a simple click.

issue 2 :
drag and drop works ( command drag and drop due to 1 ), generating
mouseDown
moudragged, mouseDragged
mouseUp

but mouseMove doesn't work.