Thanks for the info on this. It's kind of lame seeing as analog triggers in Smash 4 are useless. Well, at least we don't have to worry about making modded controllers tournament legal... for now.
edit: It's been a while since I opened up a Gamecube controller, do you think a stem made from let's say a segmented gluestick (the sticks for the hot glueguns) could fit in the trigger and give you the shorter actuation.
I had a wavebird open laying about, not sure if the trigger is different from wired controllers, but a gluestick would definitely be too large for it.
I think what might work better would be something like the end off an ink cartridge from a bic pen or something. a nice small diameter. The button mechanism would hold it in place nicely without having to glue it down or anything.
Or, maybe the shaft of a q-tip would be better, the rolled paper kind. should give it a nice damp feel, not too mechanical and rigid, which I feel might be a bit of an annoyance with hard plastic.
Maybe even keep the cotton on one end so that you're not skewering the silicone.
Edit: q-tips seem to work really well, but it takes a number of tries to get the length ideal.