Saw this in some forum, not sure it works for u guys or not, but I find my home button become more responsive after did this:
(1) Run any app
(2) Press & Hold the power button on top till the "slide to power off" red bar appear
(3) don't slide it & release ur power button
(4) now press home button few seconds till the screen back to ur home screen.
(5) Walaaa now ur home button is back to "normal" again
I saw quite many ppl claims that this method really works, and it works like a charm for me too (not placebo effects)
Cheers