Optical joystick as an app launcher/replacing the app on phone menu

[prchohan]

Hi forum members, I have a quick question. Is there an app/solution/setting to assign the double click of optical joystick to an app? (kinda like iPhone favorites). Also, is there a way to replace the default dialer app with another app? i.e. when I click "Phone" on the home screen, is there a way to bring up a different dialer app? Thanks much for the help.