KDE has supported the use of the Print Screen button as the hotkey for running KSnapshot for ages; to the point I can’t remember when it didn’t work. I used this feature heavily in Feisty, as it meant a single keystroke captured the screen, and brought up KSnapshot to deal with saving it (to wherever I wanted, including the network [go fish io_slave!]).
Gutsy broke this. Bug reports show it broken in Tribe 4 and Tribe 5, so I’m surprised it made it into the release version (which has even had updates released). This was an upgrade installation, so I’ll have to poke around with a fresh installation to see if it’s just an upgrade issue.