When importing a citation downloaded from the web in the form of a .bib file, JabRef adds and floats it as a marked entry to the very top of the references list. To reach the top one has to press PgUp several times / use the mouse which is a minor annoyance.
Keyboard users might appreciate if the Home/End keys jump to the Top/Bottom of the list a la other applications with such long lists (e.g. Foobar2000 and other such media players) for a better user experience.
PS: Additional improvements would be if the pressing the menu key could substitute as right-click for the highlighted entry.