While eagerly awaiting KDevelop4 to become stable (it crashes on me too often right now)...
I'm back to forgetting vim commands ;)
To get a list of files on the left (still need to get comfy with it, but it looks useful) use the Project plugin
Substitute (replace stuff - I've used this so often that I remember, but maybe you don't yet?)
(with % on the entire file, without only current line)
(g all occurrences in the line, without only the first hit)