You shouldn't have to restart the applications -- the change in settings should take effect immediately. You can go head and submit a support ticket (with a support archive and session file), but I would also be inclined to restart the applications just to see if something else was going on.
You're sure you changed the settings in the right agent group?
First try hotsensor placement and look into deployed sensors logs for respective agent to see your changes successfully applied. If that didn't help then restarting JVM would be good option.
You do not have to restart the app, nor do you need to do a Hot Sensor Placement. This change is runtime - it is merely changing the configuration of existing instrumentation.
Are you looking in the right place? You can't simply add the bind values column to the database dashlet. That won't work. You need to either right click within the dashlet and select "Show Bind Values" or use the "Show Bind Values" button in the upper right corner of the dashlet.
If you have used the right-click menu or button and are still not seeing the values, then I'd open a support ticket.