Hello Jeff,
I am really sorry but unfortunately this wouldn't be possible currently. If you need to customize this, take a look at the file /components/com_easyblog/views/categories/view.html.php and at line 97 onwards, locate the codes below and modify them accordingly.
$nestedLinks .= '<span class="more-subcategories-toggle"> ' . JText::_('COM_EASYBLOG_AND') . ' <a href="javascript:void(0);" onclick="eblog.categories.loadMore( this );">' . JText::sprintf('COM_EASYBLOG_OTHER_SUBCATEGORIES', count($row->childs) - $initialLimit) . '</a></span>';
$nestedLinks .= '<span class="more-subcategories" style="display: none;">, ' . $moreNestedLinks . '</span>';