And for some mental attributes, we could make it more, say, automated than that. Make it based on activity.

When running a test sim with Morale and some other stuff on, I basically made a quick formula for Experience based on the percentage of TPE a person had earned compared to the maxed out build possible: EX = 40 + ((Player TPE/Maxed out TPE)*60). Then Leadership could be a system based on playoff games or on awards earned, with seasonal boosts for captains.