I don't know if there's a clever way to do it, but if you want to run some javascript after the quick editor loads, you could modify clientscript/vbulletin_quick_edit.php. There's a function that gets called when the ajax call is complete:
HTML Code:
vB_AJAX_QuickEditor.prototype.display_editor=function(C){
(it helps if you have a program that can reformat the .js file).