We have a feature request ticket and I will add your ticket there as well.
I will mark the ticket as "escalated to developers" status and once I have more news on this, or when this will be included in WPML, I will update you.
Until then please continue to work with only supported XLIFF versions.
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Hello!
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I'm saying this because we won't be able to implement XLIFF 2.0 or 2.1 in the foreseeable future since it requires a lot of changes on our end and that can't be done soon without compromising the stability of our plugin.
We will still keep it in mind and try to find a way to implement it in the future, though unless something prevents us from doing so.