It'd be a big risk to invest a lot of your time into iZone. I mean, sure, it has a lot of potential and you can do a lot with its theme, but realistically the changes might only bring 100 new unique players - if the work is finished at all.
If you do want to contribute, then by all means go for it. There's a lot of ideas in the Future Improvements sub-forum such as the
One Month Long Mega-Event or
The Network that are very inspirational concepts.