One Sketchy Idea:
A combat class character can select a "stance" to take in battles. They can select from options like:
"Command From the Rear" - Lowers your chance of gaining skill in Swordsmanship and Jousting and decreases the H/P earned but virtually Guarantees a Leadership Skill Increase.
"Fight at the Fore" - Lowers the chance of gaining skill in Leadership and increases the chance on injury but nearly guarantees an increase in the sword (if leading Infantry) or the lance (if leading calvary)
"Balanced Approach" - Pretty much does what we already do.
