Nice engine!
Oh ya talking about Ideas, maybe you could implement Refine System like this EO? http://revolutionmaker.forumeiros.com/t138-downloadeclipse-advanced-v3-0-15-refine-system
and when you give someone buff from spell, it shows tiny picture about the buff time. once the picture is gone, it means the buff ran out.
Also the buff and heal spell AoE is only for people in the party, because if not it will heal monsters too and sometimes it makes the game crash
Sorry for my bad english.