A grouping of folder/collapsible hierarchy with macros would make them much more manageable for many DMs and players. Three main features: 1) Ability to group macros 2) Ability to name groups of macros 3) Ability to collapse groups A lot of us find scrolling through a seemingly endless list of player, monster, and other macros cumbersome. You could make them more dynamic, but that takes some expertise and front loaded work to set up, which isn't everyone's style. Even for characters in a campaign that set up skills, spells, and others this would be helpful. I kept it really simple for simplicity in implementing, but if there's anything I should add, post away.
