COGS created at invoice date not shipping date

Would like an option added to DEAR for COGS to be dated based on teh date when invoice is authorised not the shipping date. As a B2B company, we often ship goods with a 2-5 day shipment time and can't invoice until the customer has received the goods and we have a Proof of delivery.

When this happens near the end of a month we end up with COGS in one month and invoice in the next. 

Please add a function that allows COGS to be created at invoice date not shipping date.