Disable not-available options in administration instead of hiding them
I confess I have just spent an hour searching Redmine issues and Wiki to find out how to make my % Done bars reflect Issue Status rather than manually entered % (which we normally do not use).
I felt dumb when I found it - because it is obvious when you know how (like so much of Redmine). The % settings for each status are only visible in the UI when you enable the 'Calculate the issue done ratio with: Issue Status' option and save first.
I had been in an out of both screens numerous times, but obviously never in the right order!
Might I point out that there is a reason Apple mandated that disabled menu items remain in their normal location but greyed out (rather than being removed from the menu which was the practice in DOS apps) so that even if unavailable users could register the location of the menu item and would be able to find it when it was relevant and needed.
Same here - why not show the Status % values all the time? You could even add a note at the bottom "Status % values not currently enabled in settings" if you are worried about confusing people.
This reminds me of the right click edit menu - which is great once someone demonstrates it to you, but you would never discover for yourself...