As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I've been developing apps and frameworks for several years (since I was in college). Pre-Vuo projects include Kineme Quartz Composer plugins, iOS apps for education, an app that analyzes photographs of tomato slices, and software to help people with disabilities use talking keyboards.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
Adding ports to control phase, wrap mode, and sharpness sounds good. Opened for voting.
You can already make repeating colors with the Copy List Item Groups nodes (a more general-purpose solution). Just feed that into the gradient node's Colors port.
As a workaround until this feature request is voted up, you can increase sharpness by putting the same color several times consecutively in the list (as in the attached composition). Or if you happen to be working with just 2 colors, you can use the Make Stripe Image node.