Alright, as requested here is a remap of the silly faves button on the espresso launcher. This is from the CR_Mod 2.2 espresso build. However it should work fine with any rooted 2.2 non-odexed espresso.
This will allow you to re map it to open any app installed on your phone, or various system settings, or open a quick launch box with a selection of 8 or so apps. I did this method over on the G2 forums as it is easier than mapping to each individual app requested - not to mention even better since you can remap it any time on the fly.
You MUST have the launchkey app installed. It is available on the forums for free here, or better yet, help the developer out and buy the one on the market for a mere 0.65 cents. It's dirt cheap and it has more options!
Install the launchkey app from above
Grab the attached file below
Boot into recovery
adb shell mount /systemReboot
adb shell rm /system/app/Rosie.apk
adb push [your saved file location]\Rosie_espresso2.2_custom.apk /system/app/Rosie.apk