Many features get released over time and I'd like a way to visually show that 'one' feature can take a year but iterations can be released throughout. I picture 3 or 4 or more features on a baseline to show that they are all linked or related. In a sense this can also show a perquisite or a dependency.
Thank you for your idea. This can currently be done a couple different ways.
The gantt chart allows you to show features with dependency lines drawn between them. Just click and drag the dot from one roadmap bar to the other.
A custom roadmap can be configured to show features on the same line. In the custom roadmap, click the customize icon and choose Compact view. One caveat is that dependency lines will not be shown on this roadmap.