I don't own the heroes expansion for BattleLore, but I'm familiar with the Ancients leader rules, so I've been adapting them for BattleLore. I really like the added tactical options. Leaders let units hit on Lore in close combat, make single units bold, and allow foot units to make follow-on attacks. They add a bit of role-playing without being complicated. There are no record sheets and the leaders don't gain levels or experience, but they are fun to use and very easy.
I almost never use a Lore Council when I play. I only use the Lore Cards suggested for Medieval combat. Again, simple.
I'm wondering if others have done similarly.