I want to set up a retainer project to track and bill time spent on monthly website care plans. The plan is already billed through Hectic on a Stripe subscription, but I charge an hourly fee for work over 1 hour/month. For each subscription, I want to create a monthly retainer project with a $0 amount, 1 hour max estimate and $75/hour overage rate. Then I'll invoice monthly for those clients over the 1 hour mark. One problem: when I try to create the invoice I'm prompted to set an amount for the project. I can get around this by using $0.0000000001, but that's a hack.

Two questions:

1) Is it possible to enable the ability to have $0 amount retainer projects?

2) Is there a better way to achieve the same result with Hectic?