Spamming Ctrl+d for every interactive tree you want to place is annoying, and more annoying is that actor foliage which is the tool that would make foliage 100% easier and natural looking, is currently locked for users.
Another thing I would love is Runtime Virtual Texture, uefn definitely needs that because the game uefn is on has a cartoonish style, which makes it perfect for grass being the same as the ground
One last feature we need is more fortnite original textures, they generally are the most quality and most similar to the fortnite style, and the problem with importing textures is that they always get their resoultion lowered and looks horrible.
But overall the most imporant feature is definetly actor foliage.