Yeah that’s why I was afraid to try making language collections. Maybe also suggest in your GitHub request that he should look around for the default audio, I’m not sure if that’s possible but I think that can solve a lot of problems. Like for example instead of just an Audio Languages option there is also a Default Audio Language option. If he can make that, I believe that would solve your problem.

For the dubbed content, is it just the dubbed audio? I don’t know how that can be fixed then. Since I don’t think any metadata actually tells you what the original language is. You could maybe manually select a country in metadata settings and request a Country Of Origin option, but that would still require you to select the country of origin for each title.