Some editing features are best used if the audio selection boundaries are on “Amplitude Zero Crossing” points.
e.g., You will get clicks in playback if you are not on a zero amplitude crossing point & doing large adjustments in “Amplitude” and “Clip Fix”.
It would be valuable to have a “jump left to nearest amplitude zero crossing point” and a “jump right to nearest amplitude zero crossing point” after you have made an initial audio selection.
Audacity already has “Select Menu: At Zero Crossings” (shortcut “Z”)
http://manual.audacityteam.org/man/select_menu_at_zero_crossings.html