On kubuntu 6.10 with 2007.1 stable I did set UTF-8 as default for new source files.
Now when I use Assist++ to write down function and parameters in the editor I do get:
String s = Garble(const char *s� const char *e)
The "comma" between parameters is some weird character, not comma.
A feature. Replace the first parameters with the real one (const char *s is selected), then press ',' (after replacing the first parameter, cursor will be before that 'weird' character).