An alternative to the home button.
You can create or remove two notifications in the notification drawer that can not be cleared by system.
One is for going to the home screen.Another is recent apps switcher.
(you can create three shortcuts:ToHome,Recente apps switcher,Drop down the status bar.)
+I'm not sure it's compatible with all version of android.
2.2.2 add floating buttons(need root access)
2.2.12 add floating buttons(not root)
bug:floating button lose its position when screen orientation changed
+add an option to change the orientation/size of floating buttons
+add floating buttons(not root)
add an option to place the combined notification at the top forever.
keep the place of the floating buttons when the screen orientation has been changed.