Yeah, we have the "iOS background blur" layer with several variants. But it would be cool to have a custom blur option, too. I guess your OS oriented blurs take the native information from the different operation systems like iOS or Android (if running on the device) or it just imitates them but sometimes I am working on products that have custom blurs at different spots and it would be cool to use them instead to have a "placeholder" blur or a blurred image imported from Sketch.