Kiln Harmony won't save as much money and angst as a DVCS that automatically converts tabs to spaces and back, based on personal settings, or one that changes bracket code formatting, but it's a start.
It's not too hard to write a Mercurial extension to do that kind of thing. Copying the code for the EOL extension (http://mercurial.selenic.com/wiki/EolExtension) and modifying it would be a good start.