Hi Davide,JP2000 file compression varies with that of JPEG and image content plays huge role in JP2K file encoding. That is the reason jp2000 images are usually same size or higher in size.Also, going through JPEG 2000 - Wikipedia , JPEG2K spec does not mention size reduction as an advantage

You can try something like creating a folder under /apps and then creating own metadata form. You would need to write a js to invoke the metadata form while asset upload.I see some implementation in a blog - Experiencing Adobe Experience Manager - Day CQ: AEM 63 - Touch UI Assets Console add Metadata while Uploading FilesYou can refer here for some guidelines as well.

When you create FBX files in third-party applications, Adobe recommends the specific configuration settings (see link below). These settings can help you achieve the best results for 3D files that you intend to use in AEM. The option names are taken from the Autodesk Maya FBX Export Options dialog box.Link - Working with 3D assets

You can create your own custom DAM handler and create application logic to meet your business requirements. When an asset is uploaded - you DAM handler is fired and will perform the task that you want it to. See Adobe Experience Manager Help | Creating a Custom Adobe Experience Manager Dam Media Handler

You can refer for such examples at Digital asset management for web pages with AEM Assets - Experience Delivers

You will have to overlay quickaction.jsp - /libs/dam/gui/coral/components/admin/contentrenderer/card/directory/quickActions.jsp

Please refer the documentation for Extending Asset Editor and Extending Assets Search under Customizing and Extending Assets.

Instead of manually creating a node structure for the options in the CRX repository, you can define the options in a JSON file by specifying corresponding key-value pairs. Specify the path of the JSON file in the JSON Path field. For example, you can define the key-value pairs, image/bmp, image/gif, image/jpeg, and image/png and specify their values.Please refer documentation for Search Facets

You are trying to access an authoring instance, which requires permissions to access it.We have an example of a outside client hitting a Sling Servlet that does not require authentication. See this article:http://helpx.adobe.com/experience-manager/using/post_files.html