Tip: Delivering product via email and tracking shipments

[AbleMods]

Scenario:
I have certain products that are electronically created based on the customer inputs during order entry. The result is dynamic for each customer and delivered via email to them. But I also have physical products for sale. I need a way to track shipment/processing of both the dynamic emailed product and the physical products, especially if the customer orders both on the same order. Digital goods won't work because the product isn't static across all customers.

My Solution:
Create a second warehouse. The default one is for physical products and the second one is for the electronic products.
Assign the email delivery products to the electronic product warehouse. All other products remain in the default warehouse.
Create a new Shipping Method. I named mine "Email Delivery". Leave it set to flat rate with a zero shipping charge. Unless you want to charge for email delivery.
Now assign the "Email Delivery" shipping method only to the electronic product warehouse.
Assign all other shipping methods to the physical product warehouse.

Result:
Customers are prevented from choosing the wrong shipping method for the wrong type of product.
Every product ordered is treated the same via the order admin screens.
Order status will properly reflect partial shipments even when the order has both email delivery and physical product on the order.
I can write simple code to filter through open orders to quickly determine which email delivery order items still need to be filled/processed. This paves the way to automating the process of filling email delivery orders.
I can modify the customer order history page to allow them to re-send themselves their email delivery product.

So far it's working well for me. There might be a better way to do it, but this was the best I could figure out.