I would like to be able to add a factor to a previously ran Custom DOE. So an extension of the augment DOE platform that allows me to add a new factor where I could tell you what that factors was set to for the runs that are already done.
It seems this Wish List item is still needed, so that users don't rely on workarounds and "tricks" to augment their DoE in the correct way : Add new levels to a design
I do think making it easier to add additional colums/factors to an exisiting design would be beneficial. It is a task I frequently have to do when working with a team to design studies. Being able to do both adding factors with optimal factor levels and/or adding rows to the design to reduce confounding and increase power would be a great new feature.