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Adding new terms to non-default termbases

New-ish Studio 2017 user here. I find it very frustrating that I can only add new terms to the "default" termbase. Someone said in a previous thread that this is "technically more difficult than it seems", but I don't think this is a valid excuse when competing programs (WordFast Pro and MemoQ for example) have managed this just fine for years. 

Can we expect to see this solved in the near future?