Sorry I missed a step:
1. Open the database > difficulty table > change the flashbacks column from top to bottom so it reads as: 4, 3, 2, 1, 1
2. Go into the game, choose a difficulty preset (don't change anything), exit out and save (don't do a race, don't do anything else, just exit the game after saving.)
3. Now open the database again > difficulty table. Find the "flashbacks" column and change each entry to 90 or whatever number you want...I'm not sure if it can handle 3-digit numbers, so best not to go above 99
Save the database.
4. Launch F1 2012, go into the options, and set your driving assists and AI difficulty as you prefer BUT DON'T TOUCH THE FLASHBACKS. Don't even scroll down to it. It should show as "4", but the left/right arrows next to the "4" should both be grayed out. This means it's working. If you touch the flashbacks setting, you'll have to start all over again.
5. Exit out of the settings menu so it autosaves your settings, and go race with 90 flashbacks