[Imp]

In my view probably not most programmed fire requires stationary fire & the majority of units that use it have a giro fitted & will often move before firing.
Timed burst has to be very accurate to work so fire against units in defile on a slope - through a window - at a helicopter etc requires Lase then set time fuse for exact distance.
It would need extra HE kill only if has not used any move points or some such. For the impact it would have in a battle happy with as is.