Ok, so to whom it may concern, I've found a solution with a little script:
<script>
jQuery(function ($) {
$('nav a').addClass('menu-active')
$(window).scroll(function () {
var scrollPos = $(window).scrollTop();
$('.menu-section').each(function (i) {
var topPos = $(this).offset().top;
if ((topPos - scrollPos) <= 80) {
$('.menu-active').removeClass('menu-active')
$('nav a').eq(i).addClass('menu-active')
}
})
});
});
</script>
and according CSS, which can of course be dealt with as you please:
nav a.menu-active {
color: red;
}
To me, it seems nice and clean, but maybe some of you have suggestions how to make it more elegant? It might be a useful feature for future updates, including this as a setting where the other Anchor settings are.