When Quantize to Frames is enabled it helps insure that cut edits are on video frame boundaries, if cuts are between frames there is a fleeting cross-fade on playback with many of the edits.
The purpose of being able to turn off Quantize to Frames is for the very purpose of sliding audio at a much finer level than frames.
The Options > Customize Toolbar dialog will let you put an icon on the menu bar for Quantize so you can just click the function on and off, thus being able to edit picture and multitrack sound without leaving the application, etc. .
P.S. When you turn off Quantize and zoom in to adjust audio, beware and make sure that the Auto-Ripple toolbar button is OFF so that you are only moving one audio event. Otherwise your finely layered lasagna will become spaghetti.
Just as an offshoot to this, instead of scrolling through the list of stuff just type 'snap' into the box at the bottom of the internal prefs page - it filters out all of the items that don't relate to 'snap'.