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copied!<p>On the <code>Varien_Data_Form</code> instance you can specify custom element types like this:<br> </p> <pre><code>$fieldset->addType('custom', 'Your_Module_Model_Form_Element_Custom'); </code></pre> <p>Then, add your element with<br> </p> <pre><code>$fieldset->addField('the_name', 'custom', $optionsArray); </code></pre> <p>If you are using a form without fieldsets you can do the same on the <code>Varien_Data_Form</code>instance, too.</p> <p><strong>EDIT:</strong> Expand answer because of new additional details in the question.</p> <p>In the class <code>Mage_Adminhtml_Block_Widget_Form::_setFieldset()</code> there is the following code: </p> <pre><code>$rendererClass = $attribute->getFrontend()->getInputRendererClass(); if (!empty($rendererClass)) { $fieldType = $inputType . '_' . $attribute->getAttributeCode(); $fieldset->addType($fieldType, $rendererClass); } </code></pre> <p>Because of this the attribute <code>frontend_input_renderer</code> on the attributes can be used to specify custom element classes.<br> This property can be found in the table <code>catalog_eav_attribute</code>, and luckily enough it isn't set for any of the category image attributes. </p> <p>Given this, there are several ways to apply customizaton. </p> <p>One option is to simply set the element class in the table using an upgrade script.<br> Another would be using an observer for the <code>eav_entity_attribute_load_after</code> event and setting the input renderer on the fly if the entity_type_id and the input type matches.</p> <p>So it is a little more involved then just regular class rewrites in Magento, but it is quite possible.</p>

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