What is on the project ideas page... are just ideas, not a fixed set, and "Your Own Idea" is one of those 
We also say "Read our GSoC ideas list and pick one you’re interested in, or come up with your own idea." on Information for Interested GSoC Students
If you like this idea or you have another idea, please suggest it and we will see if it gets a good enough discussion going and ends up having some concrete implementation thoughts.
This is the beauty (and the pain) of open source... things are open to discussion, including what becomes a priority. We love ideas! We also love people who make ideas happen.