One thing that would be handy, Rather than having monthly products that get invoiced 14 days before - Thus sending vast amounts of emails over the year, If we could set the generation term per x amount of days.

31 days or under - 3 days
1 months to 6 months - 7 day
6 months to 12 months - 14 days
12 months to 36 months 28 days

This would allow us to be less spammy over different periods of time packages whilst also allowing longer term clients, a longer period of awareness!