In Korea (or Japan or China), We use CJK composer with kinsoku.
But sometimes we have to use World-ready Composer when we insert a right-to-left word (such as Hebrew word) in paragraph.
Then we have no choice but to abandon kinsoku.

So I and many Korean designers want to use kinsoku in World-ready Composer (or in CJK composer, to use right-to-left script function in Hebrew, Aribic, etc., as in World-ready Composer).