I'd love an Immediate Mode API, give me full control, or give me access to your OpenGL context, i'll write my own UI
They also need to improve the layout system for their panels, Origami is good, but sometimes using your mouse is better
And i agree about getting stuff to Package Control, it's unnecessary painful
Other than that, it's the perfect editor, but that plugin API holds it back, lots of missed opportunity, specially with the advent of AI stuff