Configurable USB Loader as the name suggests is a customizable USB loader for the Nintendo Wii. Configurable USB Loader allows you to change nearly everything you can’t with other USB loaders such as WiiFlow or USB Loader GX. Configurable USB Loader suits as a well built alternative with a multitude of additional features, a full list is provided down below:

• SDHC and USB HDD device support
• GUI and Console mode (switchable runtime)
• Background Music (.mp3 or .mod)
• Themes (switchable runtime)
• Widescreen (auto-detect)
• Transparency (covers and console)
• Cover images download
• Cover styles: 2d, 3d, disc
• Automatic resize of covers
• Renaming game titles (using titles.txt)
• Per game configuration of Video mode, Language, Ocarina cheating
• Light up DVD slot when install finishes, optional eject
• Childproof and parental guidance
• USB HDD with multiple partitions supported (WBFS for games and FAT for config, covers and other resources)
• SDHC with multiple partitions supported (WBFS for games and FAT for resources…)
• Custom IOS selection for better compatibility with USB drives and other USB devices.
• cIOS supported: waninkoko’s 247, 248, 249 & 250, Hermes 222, 223, 224 (mload) v4,v5, kwiirk 222 & 223 (yal)
• Banner Sounds
• Loading games from .wbfs or .iso files on a FAT or NTFS partition
  (with waninkoko cios rev18+ or hermes cios v4+)
• Loading games from DVD
• WiitDB support for info, sorting and filtering of games
• Configurable

List of features provided from GBATEMP forum post.