Possible to customize the look/length of CKEditor Styles dropdown?
After a good bit of trial and error (I'm slow, but persistent), I've figured out the classes to modify the height and item styles in the CKEditor Styles dropdown. Here's an example using values that work for me:

div.cke_combopanel {
  height: 300px !important;
}
li.cke_panel_listItem a {
  padding: 3px 5px !important;
  font-size: .8em !important;
}


The div and li prefixes aren't required; I've included them here simply to identify the element types involved. Setting a fixed height for cke_combopanel is an imperfect solution, but better than the short one I get by default.