Subfolders in the voicebank list?

[LoneryW]

When you have a lot of voicebanks installed, the list becomes really cluttered and it's difficult to search for a specific one. Would it be possible to implement an option to divide it into more dropdown lists?
e.g. classic... > Merry Kohaku > Merry Kohaku Acrobat instead of just classic... > Merry Kohaku Acrobat.
Even one layer would go a long way, since a lot of utaus have a lot of different voicebanks for different expressions.