Hello there!
The asset ID that is used by Lansweeper is a primary key that auto-increments and is generated automatically when a new record is inserted into the tblAssets table. It is not possible to change the asset ID to a different format.
You could add a custom identifier in your custom fields, however, these cannot be used with the built-in QR code feature.
We have added your detailed requirements to our customer wish list. We aren't able to guarantee that this feature will be implemented or provide you with an estimated release date at this time.