Aee also: RFE | iA Wiki/Blue-Sky
These are requests for enhancement which are either extremely difficult to implement, or are very different from the normal specification. Blue-sky ideas are generally written for a utopian world and have lofty goals often unhindered by real-world or even obvious hurdles.
A good example is the public sphere. This Wiki has a Blue-Sky list.
Related
TakeDown.NET -> “Blue-Sky”