We too found out a long time ago that we as controllers don't need to get into the how too or the human factors stuff. What we found that worked was to work with the engineers to make sure that what they were building was something that we could use and told them HOW we used it.
As for the Human Factors stuff. What we did was tell the FAA that they had to bring in the human factors scientists when we were working with the engineers. Then we could give our input on improvements that we would like to see and the Human Factors folks would say were things should be placed as well as what color it should be... It works out well that way...
regards