1- to stop bannerbomb from running when you access the sd-card, delete the private folder.
2- Install priiloader, this should fix the hombrew issue. There is also preloader jodi mod, which should also allow you to access the homebrew channel. You just install it over preloader, no need for anything else. This is not a big issue unless you wish to autoboot into the homebrew channel, I have yet to fix it.