Pretty much what i said on the tin really.
Its a small minor feature changes that isnt going to be ground breaking and probably would take more dev effort than its worth but being able to tell when a call was missed would help tell if its a new missed call or an old one..
10 missed calls from person x in the past hour.. damn it must be important...
or
what no one has called me in 20 days.. damn.. id better get my new grid number out there..