In general, the idea is good with one big BUT. In this editor, i can say that it is almost impossible to set, for example, accelerating or decelerating bpm sections. The interface is not very user-friendly and relies only on keyboard shortcuts, which do not always work (at some points I just can not change the bpm, just does not work). Any audio format programs make such moments clickable, and keyboard shortcuts are used for actions. I would like to make all such moments as choosing a bpm and setting a timing point as easy as possible, without keyboard shortcuts and scrolling. Fast and clumsy, it greatly simplifies the process.
In the current format, the editor is difficult to use for multitiming, where there are not 3-5 sections with different bpm, but 50 sections with a difference of a couple of seconds. In the simpler case, using it is pointless, since the basic editor in the game either copes as well or better, since there are simply more user-friendly.