I was thinking, what about adding user dictionary support too? Some dictionaries, like the one from Ruby, can’t be used anymore in VOCALOID 5/6, and then you could just can use English phonemes to make one, you could add support for all the current VOCALOID languages, Japanese, English, Korean, Chinese, and Spanish, and if writing the dictionaries directly in the editor like in V4 isn’t possible, maybe just create them outside the editor and then load those dictionaries into the editor, this would be especially useful for Chinese and Korean because it would let you create a dictionary for writing in Hangul for Korean or Hanzi for Chinese, or even make a dictionary that lets you write in a completely different language based on the voicebank's phonemes, like using a custom Thai dictionary with a Japanese voicebank