I don't know whether this will help the poster, but for what it's worth...

I use two products (and which one depends on exactly what I'm doing)  in the course of getting photos from my camera to my PC:

1) jhead, free, http://www.sentex.net/~mwandel/jhead/
2) Downloader Pro, pretty cheap, http://breezesys.com/Downloader/index.htm

Among other things, these two pieces of software allow you to automatically name photos based on the image-capture date/time in the EXIF info, either during actual download or after the fact. I generally don't bother, but you can also append a string. I imagine there are other apps that perform similar duties, especially in the non-free category, on both PCs and other operating systems.

Thus, my images get named 2014-09-04-14-59-59.jpg, for instance. If I'm downloading from another camera and I happened to have taken another picture at the same second (doesn't really happen), it would get a (2) or A or something right before the period. Adding a string option would yield something like 2014-09-04-14-59-59-such-and-such-project.jpg.

The point is, if you (re)name pics based on when they were taken, software that later sorts only by file title will also have your pics sorted by image-capture time.

I don't mean to insult anyone if this info is not applicable in your particular case, or if you already knew about this sort of thing, etc.

Cheers,

Bill

@wspollack

Thank you for your input. Any information which might help is appreciated.

@patrick7

With regard to my original suggestion of creating a gallery with JuiceboxBuilder-Pro and then doing the sorting dynamically via PHP when the gallery is displayed (rather than when it is created), here is an example which will display the images in the order in which they were taken (comparing the EXIF 'DateTimeOriginal' values for each image) from earliest to latest.

(1) In your gallery's embedding code, use a configUrl to point to a PHP file named 'sort.php':

<!--START JUICEBOX EMBED-->
<script src="jbcore/juicebox.js"></script>
<script>
    new juicebox({
    configUrl: "sort.php",
    containerId: "juicebox-container",
    galleryWidth: "100%",
    galleryHeight: "100%",
    backgroundColor: "#222222"
});
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

(2) Create the PHP file named 'sort.php' with the following code:

<?php
header('Content-Type: application/xml');
$xml = simplexml_load_file('config.xml');
$arr = array();
foreach($xml->image as $img) {
    $arr[] = $img;
}
usort($arr, function($a, $b) {
    $a_exif_data = @exif_read_data($a->attributes()->imageURL);
    $b_exif_data = @exif_read_data($b->attributes()->imageURL);
    $a_exif_date = !empty($a_exif_data['DateTimeOriginal']) ? strtotime($a_exif_data['DateTimeOriginal']) : '';
    $b_exif_date = !empty($b_exif_data['DateTimeOriginal']) ? strtotime($b_exif_data['DateTimeOriginal']) : '';
    return $a_exif_date - $b_exif_date;
});
$dom_doc = new DOMDocument('1.0', 'UTF-8');
$dom_doc->formatOutput = true;
$settings_tag = $dom_doc->createElement('juiceboxgallery');
foreach ($xml->attributes() as $key=>$value) {
    $settings_tag->setAttribute($key, $value);
}
foreach($arr as $img) {
    $image_element = $dom_doc->createElement('image');
    foreach($img->attributes() as $key=>$value) {
        $image_element->setAttribute($key, $value);
    }
    $title_element = $dom_doc->createElement('title');
    $title_text = $dom_doc->createCDATASection($img->title);
    $title_element->appendChild($title_text);
    $image_element->appendChild($title_element);
    $caption_element = $dom_doc->createElement('caption');
    $caption_text = $dom_doc->createCDATASection($img->caption);
    $caption_element->appendChild($caption_text);
    $image_element->appendChild($caption_element);
    $settings_tag->appendChild($image_element);
}
$dom_doc->appendChild($settings_tag);
echo $dom_doc->saveXML();
?>

(3) Place the 'sort.php' file in your gallery folder (in the same directory as the gallery's 'config.xml' file).

This solution relies on the images in the gallery's 'images' folder having EXIF info.
Please note that JuiceboxBuilder-Pro strips EXIF info when resizing images so, if you are using JuiceboxBuilder-Pro to create your gallery, you may need to resize your images in an imaging program such as Adobe Photoshop (and ensure that the EXIF info is retained when saving them) before feeding them to JuiceboxBuilder-Pro and then deselect the 'Resize Images' checkbox (on the 'Images' tab) so that JuiceboxBuilder-Pro just copies the images (with EXIF info intact) into the gallery's 'images' folder.

I hope this helps.

Thank you for posting your suggestion in the Feature Requests thread. (It keeps all the suggestions together and ensures that they are not overlooked.)