After clicking the "Start" button, there is a page for the operator to change some
ODB values. I have created "/Experiment/Edit on start" and added some links there.
If the link is pointed to a boolean type key, a check box will appear in the
"Start" page, which is great. But how about if I want to have some radio buttons
or pull-down menus for the operator to select among different calibration sources
or running modes?