I wonder when QBO would make it possible to customise remittance advices and payment receipts

Hi winnkoh, 

I understand that you want to customise other forms aside from the Invoice, Quote, and Sales Receipt. For now, we're unable to provide you when exactly this will be available. 

For updates, you'll want to check our QuickBooks Blog. All our new features and innovations will be posted there. In addition, visit our QuickBooks Help page for more tips in managing a business.

I'll be here if you have more questions. Stay safe!