I have two requests to start with.
1. Add a Metatron template. Basically a template that allows you change the different mini circles.
The Metatron makes for a great magic circle that contains several sub circles. I have giant Metatron puzzle planned in the campaign I have been designing. This Metatron isn't magical (though that may change with this Magic Circle Generator) but it covers the floor of a large room and is a puzzle that the players must solve using keys they have acquired elsewhere.
2. The ability to add basic shapes like squares, triangles, circles, diamonds, etc. It would be really cool in combining this with the request above and having the ability to make templates.