Besides swapping out the whole clutch for a higher performance, MUCH stiffer sprung setup, using a single mass flywheel, there really is no way to accomplish this.
Even swapping the brake/clutch system fluid for a much more viscous version than our super thin DOT4 LV would probably not make much difference, but you could try that, especially if you need to do this anyway.
(It does not seem like the spring in the pedal assembly can be swapped out, does anyone on here know for sure??)
I do understand what you are speaking of, since unlike almost everyone else on here who came from Honda and the like imports, I came from a latter day muscle car ('00 Z28) with an LS7 clutch installed, and this car's pedal felt like pressing in NOTHING AT ALL as compared to that one's light weight leg press effort, and it was difficult for me to modulate it at first (combined with the whisper quiet factory exhaust).
But I DID eventually get used to it.
![Smile [:)] [:)]](/images/smilies/smile.png)