Re: Alt + F2, How to add your own shortcut(s)?
It's not really clear what you're asking for. Are you using GNOME 3? (If you're using Fedora 15 or newer, and didn't explicitly ask for a different desktop, then you probably are.) Assuming so: Alt+F2 is already taken for running entering and executing command-lines. You can change existing short-cuts and add new ones in System Settings->Keyboard->Shortcuts.