Update

Following their recent updates , the PlayStation 4 modders at e✘treme-Modding.de shared a PS4 1.76 database modification today for running installed PS4 Package (PKG) files on a USB HDD.To quote: You can run your installed Apps and Games from USB HDDI have tested it with OMSK, it’s simple. Install OMSK PKG ( OMSK PKG OMSK RIF ), copy user/app/NPXS29005 on your USB device (FAT32/exFAT) and delete the folder (NPXS29005) on your PS4 HDD afterwards.With the Database we can mod a few things in our Home Menu, so you have to edit table tbl_appinfo and search for the title_Id (NPXS29005). Change _org_path to /mnt/usb0/user/app/NPXS29005, that’s all. Now you can run the App only if you plug in your USB device.Just a solution for people who have a small hard drive in their PS4Thanks to @HydrogenNGU for the news tip on Twitter : Here's one more 1.76 database mod from e✘treme for those following, to quote:Soon we can create custom PKGs to install Games without license. It’s recommended to add your installed PKGs to Games folder in the Home Menu if you have installed a lot of Games.The Database Mod is very simple. Just edit 'dispLocation' -> 2 in app.db to add the Games to the folder. TV & Video is the Games folder, edit 'visible' -> 1.