Why are these builds called RC anyhow?  RC is Release Candidate, meaning it's a beta and if no problems are found and people like it then it goes gold and is released as-is.  That is not what these builds are, there is no intention to release DRK as finished after RC3 (or 4 or 5) no matter how well it goes.

Why not just use proper beta numbering?  Maybe call them milestone releases or something like that.