Currently, Piwigo doesn't offer an out-of-the-box feature for using keyboard shortcuts (such as pressing 0-5 to rate a picture). However, it's possible to add this functionality through custom JavaScript or modifications to your Piwigo theme.

Here's a rough outline of how you might add keyboard shortcuts to allow users to rate images from 0 to 5:

Add custom JavaScript: You can inject custom JavaScript into your Piwigo gallery to detect keypresses and trigger the rating system. This would involve adding a script to your theme’s template files or using the plugin system if you’re comfortable with that.

Sample JavaScript code: Here's a basic script that listens for keypresses (0-5) and simulates rating a picture. It assumes that each picture has a data-id attribute and that the rating system is tied to these IDs.

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document.addEventListener('keydown', function(event) {
  if (event.key >= '0' && event.key <= '5') {
    let rating = event.key;  // Rating from 0 to 5
    let imageId = document.querySelector('.piwigo-photo').dataset.id;  // Assume there's a class 'piwigo-photo'
   
    // Simulate the action of rating the image. You'll need to replace this with the actual Piwigo function to submit the rating.
    // Example: submitRating(imageId, rating);
    console.log(`Rating image ${imageId} with a score of ${rating}`);
   
    // You could also trigger a click event on the corresponding rating button here.
  }
});
This is just a simple script that detects when the user presses any key between 0 and 5 and logs it.

To make this work in Piwigo, you’ll need to modify the code to call Piwigo's internal functions to rate the image (or trigger a form submission).

Adding the script:

You could inject the above script into your theme's head.tpl file or in a plugin that allows you to add custom JS.

Make sure to test the script on a staging site first to ensure it doesn’t conflict with existing functionality.

Custom plugin: If you're familiar with PHP, you could also write a small plugin to handle this. The plugin would listen for the keypress events and interact with Piwigo's backend to submit the rating.

Since this isn’t a built-in feature of Piwigo, there’s some custom work involved. Would you like more details on how to implement this? Or if you prefer, I can help you find a plugin or extension that might make it easier!