Using a custom roadmap with the main object of initiatives and with the setting of compact bars enabled, still doesn't make the roadmap items as compact as it could. See the image below. There is one extra line item on its own that could be moved next to a horizontal space that already exists.
With other roadmapping tools I have always been able to create a continuous progression of work on a single row, as our teams flow from one initiative/feature to another. The "compact" version of the roadmap should be just that, compact, and currently it is not. I can't capture my full roadmap in one screen like I should be able to because of this buffer requirement. It not only takes too much space, it doesn't show the continuation from one set of work to another as it should for that row. (your 'Attach files' prompt does not appear to be working in this interaction) Screen shot