Queue for Out-of-Stock Product

Note: This is more an e-commerce request.

Lately, a few products have been out-of-stock for extended periods.

As opposed to would-be buyer having to poll the site periodically, once a user has an account, it would be great to add into backlog a product, to show intent to buy and to be in a queue for something in short supply.

This is win-win for Zwift, because the company also gets fairly certain indication of demand.