With the release of version 3.4, a new feature was added to this website.
You can now see features that are planned for future releases, to give you an idea of what I'd like to see added to Mandelbrot Explorer.
This is an interactive section of the website. There is a "thumbs-up" icon that you can click to vote for the features you'd most like to see — it helps to know what the end-users of Mandelbrot Explorer would most value and use. You can also click on the title of any of the planned features to go through to a webpage dedicated to that specific feature. There, you can leave a comment if you'd like to — saying why you'd like this, making suggestions about it, and so on.
There isn't, yet, the ability for you to create your own "planned feature" entries so that people can vote for your own ideas — you're limited to voting and commenting on the features you see there. You can, however, send an email if there are specific features you'd like to see. If it's not something currently in the list of planned features, it may well be added.