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I created a page to list bugs and feature requests. That has a link to the Github URL for bug reports.
@Jacques Distler has been open to discussing new ideas for features, at a design level. That's useful as it's his call as to whether something is compatible with official Instiki - which matters as it would not desirable for us to maintain a custom version. As to whether a feature actually gets built, that will depend upon the availability of someone in the community to do the work. But the design question comes first.
As a medium-term goal, I plan to set up a test environment and learn about the rails MVC model. This is for some features that I want to build for an admin tool.