For custom user fields: Possible to recreate Genre drop-down preset list?

Is it possible to recreate or mimic the current behavior of the Genre field which has a preset drop-down item list, to a custom user list? Examples of custom user lists are Country and Language which I would like to add to Matroska/MKV/MKA.

I would like to put in my most used or so list of Countries, Languages, and others and hopefully their unicode character counterparts as well (for example: Macau / 澳門, Ukraine / Україна). Especially since I won't be able to actually remember and manually type in such non-English unicode characters after all.

Thanks in advance.

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See this thread:

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OK, thanks. It's quite a powerful Action feature.:+1::smiley: