I would like the voice synths to be more standardized in general, especially the editor itself. Let say, i want gumi but i also want to use it on piapro or synthv but it is impossible, because it's incompatible. However if they standardized the whole editor and make all voicebank use the same suffix (let say .vbxml) that alone will simplifies thing like data sharing, transport, cross platform support (without data loss) and every editor on the market can read .vbxml and can use all vbs at full potential (or at least 80% of it) and the benefit of cross platform is that you can save and export your project files to standardized suffix (let say .mscxml) and switch to other editor or send it to someone else with hassle free and actually take some of the weight out of customer back.
This is impossible and pointless to ask for but, i'd like to see it happen.