It would be helpful to have an email history of when the automated past due emails are sent as well as the MLS Administrator being cc'd on those emails. Another place they could be recorded is at the bottom of the invoice under the Invoice History.
When invoicing from bulk invoicing, it just says invoices are created - It would be nice if it redirected you to the invoice or the corresponding invoice page.
I would like to be able to take overpayments and apply them to the group's overall balance. From there balance, I would like to apply payments to their future invoices.