This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
because everyone who works here is a volunteer, and their time is extremely limited. Working on this, which would provide no real benefit, would take time away from other enhancements that WOULD provide some real benefits.
I'm not saying it will never happen, especially since I don't develop this site, but I would hazard a guess it would be extremely low on the priority list.
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors