There is nothing to worry about with preloader and bootmii as boot2 installed together. As for the disc spinning, i believe it happens when you leave your wiiconnect24 on.
-added a feature to load the system menu with any IOS version you want.
-The installer includes an IOS patcher which when found patches IOS60 so Preloader can fully work with System Menu 4.0
-Moved some text around for better visibility on 16:9 screens
-fixed a bug which let the disc endlessly spin when wc24 was enabled and the Wii got turned off
-fixed a bug which broke System Menu loading when the system got formatted