The problem is also there with the item list of the superceder,
so it is a more generic problem with the javascript classhelp windows.
The more complex one for the users works, though.

A dirty and limited workaround would be to raise the pagesize in the 
template in the classhelp link to over 50, so someone always gets all 
entries on one page.

However this javascript issue should be fixed of course
and the user dialog shows that it is possible.