Multiple sorts in Custom Roadmaps

As of now you can only sort the bars on a custom roadmap by a single attribute, but I find that I often need sorting on two attributes to get the expected output.

For example I often use "Release development start time" but even if two items start on the same date, one might finish sooner, so would add secondary sort by "Release status" if I could to get the output I'm looking for in the custom roadmap.