Thanks all, but I don't think any of you understood what I was asking (it's hard to explain things through text sometimes.)
What I was asking is, let's say I sent a long vocal sample to the piano roll, and I just wanted to listen to the first part, and let's say, about 2 seconds later of the sample, if you do this, piano roll only allows you to hear the sample from the beginning and nowhere else because it's only reading the sample as a whole and not as wavelength sample.
Sometimes I just want to send the sample into the piano roll because I might only need the beginning part and maybe something a little longer into the sample.
But my solution was (and I've been actually doing this for years, but felt it was a longer process) was to import the sample right into the playlist and chop it there, but if I usually do it that way, I have to always set the loop playback points (right clicking on the top bar of the playlist and dragging the listening points.) That takes not a lot of time at all, but if the piano roll would allow you to use the whole waveform of a sample rather than just the note length, I wouldn't have to do all that.