I would like to see Fitbit include two-button shortcuts to get to popular sections of the device. For me, I would like to hold the Home + Top-Right button to go directly to the Countdown timer, and hold the Home + Bottom-Right button to go directly to Settings.
I imagine this being implemented by going to the desired screen and holding the button combo for five seconds until a confirmation button comes up, asking if you want to set this shortcut to this screen.
Also, I would like to see the Home button go directly to the Home screen if you hold it down for half a second (just longer than the standard click). It is a pain, when using the Countdown Timer, to have to click the Home button to get out of the Countdown Timer, then click the Home button to get out of the Countdown splash screen, then click the Home button to get out of the Timer splash screen and finally get back home.