I think the const member with a default overridden by a constructor thing makes perfect sense to me. The one thing bugging me about the complaint about the breaking change is that it's a very easy issue to address. There are two solutions I like.

static const int x = 3; // static gets us out of struct storage.
enum int x = 3; // A strictly compile-time constant.

So, you just insert a few characters and the issue has been addressed. The way I see it, D is not C++, so breaking changes will happen from time-to-time in order to make the language saner. const being part of the struct is sane because it's consistent.
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