This has been in the ideas category for three years already: Inventory Write-off tab modifications. If you visit that link, you will see it was proposed by one forum moderator and supported by two others.
The fact that Manager has a separate tab for inventory write-offs but requires journal entries for write-ons (upwards adjustments) has never made a lot of sense. It is just an artifact of how the program developed. But if that tab were expanded in scope, it would be easy to include different types of inventory adjustments with terminology palatable even to @Ealfardan.