All right, I hear you :D
It looks like the option to scroll back with the mouse was something VERY important for the players as I'm getting A LOT of requests to bring it back again, although an option in the settings screen should do the trick, I am re-enabling the scroll back ability with this very small update.
Please note that abusing this might lead to unexpected behavior in Random Exams and random events, as the "random dice" gets pulled every time you scroll back and this might cause the game to behave strangely.
While I will look into the issue, my recommendation is not to abuse the rollback option for the time being ;)
Thanks for your feedback, it's awesome how this community is helping me to develop an excellent game!