I'd like that in the breadcrumb the current selection will look different.

I did this adding to breadcrumb.java:
/**

• Name for the class of selected page
  */
  private String cssActPage;
  .....
  if (this.link)
  {
  out.print("<a href=\""); //$NON-NLS-1$
  out.print(request.getContextPath());
  out.print(page.getHandle() + "." + Server.getDefaultExtension());
  if (actpage.getHandle().equals(page.getHandle())) { out.print("\""); out.print(" class=\""); //$NON-NLS-1$ out.print(cssActPage); out.print("\""); out.print(">"); //$NON-NLS-1$ }

  else

  { out.print("\">"); //$NON-NLS-1$ }

}
.....

I added first an attribute to the tld:
....
<attribute>
<name>cssActPage</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>Class for active page</description>
</attribute>
.....