It would be awesome to have "style hooks" for all components - this can be implemented through css variables/properties and would allow for things like dynamic theming including support for dark mode etc.
Because css variables/properties can be read and written through javascript this would open up several new ways for dynamic layouts.
CSS variable/properties are supported on all current browsers except IE 11, and it is possible to implement them with a gracefull fallback.
sometimes seems too small the icons in a grid,and i would be nice to have bigger incons with 24X24 ,or 32X32 pixels,because it's very difficult to find something to fit with the themes used in kendo ui.