Make average cost zero when zero on hand - please can we have a setting to Make average cost zero when zero on hand.

We have a valuation report with zero qty and valuation figure which shouldn't really happen but have a setting that resets the cost to zero when the quantity is zero keeps costing accurate.
The would need to be a setting as not all items or system would need to work this way but i would presume Make average cost zero when zero on hand should be default for most setups.