Question about piano keyboards?

I recently got a Casio CTK-720 keyboard after selling my piano (not enough room in my house for a large piano anymore). I mostly play clical music, so obviously there have been a lot of differences between the two. I know that I can get a sustain pedal for my keyboard. However, is there any way to increase the sensitivity of the keyboard keys? On a piano, a note can sound louder or softer depending on how much force you use when playing. This adds a lot of variation to a song. Is this effect possible to achieve with keyboards? Thanks!