[Replicant]

1, hide breadcrumbs on articles page. Use javascript to check if the page is articles page. You'll need to change the number 14 to the actual channelid of your articles if it is different. 14 is what it is on my system.

<script>
if (pageData.channelid == 14){    
    $("#breadcrumbs").css("display","none");
}
</script>

for #2, you can mess with this code to get you started. You'll have to play with it to make it work correctly with the responsive code and the "other" floating bar.

#main-navbar, #main-navbar-wrapper {
position: fixed;  
z-index: 1500;
}

for #3, a link to the site with a more complete description will help.