I think properties and roles should be manageable, one of the issues (and reasons we havent done) milestones is that there is a fair bit of planning/UI work to do in order to update the dates for the milestones to make sure they are compliant with the new experience start/end dates that are set. Probably all achievable, but I would also say that this is more of a feature request then a bug report.

I will forward this to product so that they can have a look at it though.