[Plugin: NextGen Gallery] Use Alt and Title fields together

In Nextgen Gallery, I am using Alt field for destination URL (where it must go to after being clicked on). It works well with the modification to the gallery.php (changing the thumbnail section imageURL to alttext).

I’d also like to use Title / Description field for a caption. To get the caption to display, I change the shortcode from [nggallery id=5] to [nggallery id=5 template=caption] and the captions are displayed beautifully.

However, with the new shortcode in place, clicking on the gallery picture no longer links to the page/post shown in Alt field.
How can I do both? (I’m not a keen coder but will do so if needed).

Thank you!