API for LED Notification
Provide an API to use the Windows button as led notification for missed calls, incoming messages or mails and other notifications.
Put (blinking) LED notification when having incoming notification to save effort every time do not have to unlock screen and checking any notification. Nokia symbian phones does have, would like window phone will have too.
IceX PR commented
Especially the LED with Windows Logo..
I hope you don't mind, but I tweaked the suggestion to be API related and less about consumer capability - great suggestion.
For consumer requests, please use http://windowsphone.uservoice.com/