Granularity on emailing invoice

Hi, 

please add a tab on invoices tab to allow account staff to control when n how invoice is emailed to customer. for example, invoice can be generated on 25th of the month, go through checking and approval. but give the account staff control to only send the invoice on month end on 28th. 

dont automatically send invoices directly from system to customer, as account, we should have the control. 

sometime there was issue, we do not want to charge customer yet for this month, we want to on-hold sending invoices until later time. 

last but not least, please also add remark session, so that account staff can add personalized message while sending to customer. for example some announcement / notifications / justification on the invoice amount etc