Are those keys standard with the K65? I recently got the K68, while I'm loving the responsiveness and general feel of the keyboard I am wishing the back-light was a bit brighter. Those keys look like they expose more light.
If you're like me and constantly switch between a headset and speakers this app will make your day...SoundSwitch
SoundSwitch: Control your audio output
You can configure a custom hotkey(s) for it as well