Ok, some people don't seem to think that the button clutch script thing is such a big deal, so I'm going to tell you how to use it. Probably shouldn't, but I don't care anymore.
1. Download the attachment, extract it and import the file into Logitech Profiler.
2. In LFS, make sure the C key is assigned to the clutch
3. Adjust Button control rate to 10
4. Turn off Auto clutch
Now enjoy amazingly fast shifts.