I have a list actually:
The option to include units with dice damage like in Warcraft, instead of just 10 damage flat, you can do 10 - 12, or 1 - 100, etc.
The option to make armor like in Warcraft 3, for example it reduces damage in % rather than flat reduction.
The option to have dice armor, yeah stfu I rather like the idea of having 1 - 3 armor, sometimes when your hit you get the 1 armor defense, other times you get the 3.
The option to mix and match sound sets, and create entirely new ones from existing sounds, for example using some Marine and Marauder voices, being able to add them to a sound set called Marinder, and being able to give units that custom soundset and have them use it in game.
A model and icon editor included, YES, no more need for downloadable tools, all right there, in the editor.
No movement speed cap, pretty basic, but this is important, I don't want my damn speed capped like in warcraft at 400 or 522 or some BS #, IF I WANT A UNIT TO DART ACROSS A HUGE MAP IN A MILISECOND THEN IT BETTER BE ABLE TO DO IT.
The ability to make anything into anything, for example if I want a tank to act as a tree then it can, instead of showing up as a colored cube in the friggin editor, saying my path is invalid or something.
A projectile system that allows for the chance of a missile or bullet to keep going in a linear fashion until it hits something, for example, if my archer fires an arrow at a unit, it won't home in on it, and it wont simply hit the ground if it misses when the unit dodges it, IT KEEPS GOING UNTIL IT HITS AND DAMAGES SOMETHING or gravity takes it down.
The option to add more types of damage, and more types of armor, for example I don't want Siege, Magic, Normal, Hero and so on only, and I'm left with them to mess with, I wanna be able to make new ones.
The option to include more umm, point systems on a unit easily, for example, mana, shield, and hit points are nice, but what if its not enough? I want to be able to add 4th 5th and so on to that.
The option to add more build tabs, for example I don't want to be left with just Buildings and Advanced buildings, what if I have more in mind? Super Advanced, Hyper Advanced, Advanced Advanced, etc.
The option to have more than 1 type of armor on a single unit, for example you have a Peasant, all he has is Medium armor, what if I want him to have 1 Medium Armor, 3 Heavy Armor, and -2 Unarmored? Don't say its useless I want that in there, I dont care if its useless, I'd like to see it!
The option to extend the build que, like with the Terran Reactors, they extend it up to 8 and allow the extra unit to be built at the same time as the regular one, making 2 units pop out, and on that note, the option to make as many units as you want be able to build simultaenously from a single factory type building, likewise with upgrades.
The option to remove the leesh on Larvae having to stay so close to the hatchery, I wanna be able to move them away and make em hatch in a different place, though this will probably be easily included anyway.
The option to make Terra Tron, Zerg Zord, and Proto Prime. (can you guess what I mean?)
The option to make units have different variations of interceptor movements, you know flying around and shooting enemy units in a swarmings fashion, except different variations and such, different times of retreat, fire, and spread.
The option to be able to include more resources, what if I have to have more than just minerals and gas? What if I want to make Dirt a resource to add some idiocy to my map? I want to be able to implement that with the editor.