1. Using CSS will be good. but i couldn't catch your exact meaning. ^^;;
2. remove {$key} : at 127 line
3. if you can handle CSS, I suggest using UL list and CSS. But following is simple horizontal links list.
   1. find <ol> and replace as <p> at 87 line.
   2. find </ol> and replace as </p> at 133 line.
   3. fine <li'.$current.'><a href="'; and replace as <a'.$current.' href="'; at 111 line.
   4. find $current_check</li> and replace as empty space like   at 128 line.
   5. and you can handle style through CSS for example...

      .pagelinks a.current_page {color:red; font-weight:bold;}
      .pagelinks a {color:black;} 
      

1. How do I customize the layout of the "jump to" box that is inserted? I would like to have a layout that is a little more bare-bones.

2. How do I get rid of the numbers in the Drop-down menu? I'd like to have just the page titles.

3. Is there any other way to insert the links list than an "OL" list? I would like to have a horizontal layout for that option.

Thanks in advance!