okay, then maybe you can set a web shortcut to launch the program?
I am not sure if this will work, since eDonkey is an external application, but you can try. I also don't know how eDonkey works, if you are expecting an application to open, or to pass it into the application. The latter would be more difficult and you would need a script to do it for you.
Settings > Configure Konqueror > Web Shortcuts
Now, click New
Search Provider Name: eDonkey
Search URI: /usr/bin/eDonkey (or equivalent)
URI shortcuts: ed2k
Once again, I don't know if it will work, but try.