After reading all the forums for answers and not finding any, i decided to try and do it myself.
I also needed the second level from the dropline (JAsocial theme) to be always open (including before page load) so i tracked the problem to:
At plugins/system/jat3/base-themes/default/js/menu/dropline.js
At the end of the file, replace:
window.addEvent ('load', jasdl_initJAScriptDLMenu);
to:
window.addEvent ('domready', jasdl_initJAScriptDLMenu);
Simple solution that should already be on this forum, i’ve seen many people ask for this and not get decent answer.
Anyway it’s my 2 cents.