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By default, thalia help goes to http://thalia.mit.edu/help. If you want user help to go to a different URL, use the <help_url>tag. For example:
<help_url>http://web.mit.edu/psb/photographs</help_url>
Customization of the upload behavior:
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<clear_upload_form>true</clear_upload_form>
Customization of the item hover tip:
By default, the item hover tip is the item title. If you want another field displayed, use the <thumb_mouseover_field> tag. For example
<thumb_mouseover_field>dc_description</thumb_mouseover_field>.
Please note, the value should be one of the 15 dublin core metadata field name.