Copy the Quicksilver script to a new location, and then replace the following lines:

using terms from application "Quicksilver"
    on «event DAEDopnt» ThisClipping

        my PushTokGTD(ThisClipping)

    end «event DAEDopnt»
end using terms from

with:

on handle_string(ThisClipping)
    my PushTokGTD(ThisClipping)
end handle_string

That’s it. Now you can activate LaunchBar, type an abbreviation for the script (I use ki), hit the space key to enter script parameter pass mode, enter you task and hit Return to pass the string directly to kGTD’s inbox.

All thanks to very clean script code in kGTD and LaunchBar