Payment Schedule / Milestone Based Payments / Split Payments (More than 2) and/or custom frequency on recurring invoices

I've research this feature and if anyone has asked about it recently and I didn't see anything. If I missed anything, please feel free to merge my request.

Currently, is there the capability to have a payment schedule or milestone based payment schedule outside of the "partial/deposit" option?

I see some older forum posts:



and a mention of milestone invoicing on the blog:



Loosely related forum post




Long story short, at times some of my projects are broken up into 3 or 4 payments over the course of the project. Is that possible? Even with recurring invoicing there isn't a "custom" interval in the frequency.

The two requests:

• Allow for payment schedules
• Allow for a custom frequency defined by particular dates in the recurring invoice module.