To my understanding from testing AEButton on the Diamond, I have realized that:
The HOME key cannot be remapped.
The Back key is essentially a "WIN" key. You can create a new button and remap the Back key. HOWEVER, the shortcuts DOES NOT WORK when you are at today screen. So here is what I do, I remapped the Back key single click to "Escape". double click to close program, long click to close all programs.
Thats the only logical thing i can think about using the back button due to the limitations.
Current Devices: DIAMOND, KAISER
NEVER SETTLE FOR ANY UNCORMFORTABLE SETTINGS ON YOUR WM!