Currently custom date fields used on a record detail view are available for selection on a custom roadmap. However, if date fields are included in a worksheet, those are not available on a custom roadmap. It would be good to include those worksheet dates, and dates from calculated columns in a list view.
I just ran into this issue where I have a roadmap that needs to show change in expected delivery. No issue with showing when the dates shift to the right, but when the shift is to the left (end date is before the start date) it doesn't work. I have a worksheet field where I can flip the start/end dates as needed, but can't pull the dates into my roadmap.
We would like a similar functionality. We have a worksheet field that calculates the release dates from 3 custom release fields (private preview release, public preview release, and general availability release). We would love to be able to view those worksheet date fields on a GANTT chart (roadmap) as milestones.