FLATO: Fixed top menu

Same question as ctuxboy, any replies?

Yes, it is. I just did it for version 1.3 of the theme.
Try this code, at the very end of your style.css:

.site-top {
	position:fixed;
	width:100%;
	z-index:99999;
}

header.site-header {
	padding-top:3.5em;
}