trackmania-2
I'm playing Trackmania 2 Stadium (beta) and I've noticed that the first time after I retry a race after beating the gold medal time, it offers to let me do an "official" race for SP points. But after that race is complete, or if I decline to do the race, I don't know how to try for another official time.
Does that option exist?
Local Game → Single Map → Downloaded → author name
Some games allow you to do this, most don't. The game "Prison Architect" for example does support this:
Theres however a second way to obtain your key, by looking for it in your Windows Registry.
Open regedit.exe (enter regedit in the "Run" window after pressing 
+ R) and browse to:
HKEY_CURRENT_USER\Software\Valve\Steam\
In there you will find folders called TestApp228760 (TrackMania 2 Canyon) and/or TestApp232910 (TrackMania 2 Storm). Inside those folders there will be an object named SteamKey containing your key.
Best Answer
You may only attempt an "official race" every 5 minutes. After finishing an attempt you will see a timer appear in the bottom right of the screen. Once this reaches zero, the next time you reset you will be asked if you want to try another official race.