Mail Alerts (Out Of Stock): Force Signup/login?

[artofadornment]

Regarding the customer "out-of-stock" Mail Alert (visible on the product page when a product is out of stock):

 

Instead of having a box where a person manually types in an email address, could the code be edited somehow to be a just a link, which activates the alert for the customer's registered email address automatically (if they are logged in)? And if they're not already logged in, force them to log in/sign up when clicked?

 

I'm new to PrestaShop (1.5.3.1) and am not a developer, although I'm pretty good at working out small problems and customizing details. But doing something like this is definitely beyond me. In fact this almost sounds like grounds for an entirely new module... can anyone offer some advice?