How to allow minus inventory yet enforce serial number input?

Requirements:
It can only be done at Location without Bin Mandatory.
In Tracking Specification, you can check options that will enforce serial no. input on various transactions BUT you MUST leave "SN Specific Tracking" unchecked.

Implications:
Serial no. will merely function as information since no strict checking will be performed, ie. a serial no. can have an outbound qty larger that its inbound.
An outbound entry can get an incorrect cost if you entry the inbound transaction later but in wrong order.