Basically, there's is a preset fruit pattern set in osu! To determine what fruits fall at what time in a spinner. And what he is trying to imply is to implement a feature to control where in that preset pattern the spinner starts at. It doesn't seem too hard to implement, really.Thanks to Kitokofox for explain my request.
It seems reasonable and fair, could develop a little more control into mapping in catch thr beat while keeping spinners random. With that, it's got my support.