As I have mentioned before the EXIF field [i]ImageDescription[/i] is specified for the image title. Please see the EXIF specification section [i]D. Other Tags[/i].
Quote:ImageDescription
A character string giving the [b]title[/b] [emphisis mine] of the image. It may be a comment such as "1988 company picnic" or the like.
Zenphoto will obey this specification so there is nothing to fix.
If your images are created with [i]ImageDescription[/i] set to "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam sit amet mi erat, ac iaculis velit. Maecenas tempus viverra quam nec consectetur" then that is the intended title of the image accordig to specification.
The "workaround" is to fix the EXIF [i]ImageDescription[/i], override it with the IPTC [i]objectName[/i] or [i]imageHeadline[/i] tag, or change the description in Zenphoto. You can also use the xmpMetadata plugin and make an XMP sidecar file to set the image title.
BTW, I know nothing of iTag, but Photoshop does implement to the specifications.