There is no official TODO-list for DMD. Its development is mostly based on volunteers work and while some enhancement requests get "preapproved" tag in bugzilla, it does not tell anything about terms when this feature can be implemented or will it be implemented at all.
Given there are a lot of much more serious issues to address right now, I hardly can expect something that minor implemented in nearby years.
Also your question actually looks like proposal and is better suited to official DMD/Phobos bugzilla: http://d.puremagic.com/issues/