Hmm, it seems like a really handy tool, but wouldn't it be difficult to use this for MMD?
From what I can tell from the description, it only seems to be able to create Animation Clips.
Of course, it may depend on how it's used.
@AliceLuv use this if u want drag n drop https://booth.pm/en/items/1258744 or can make ur own expression by editing the blendshape as gesture expression