If the time unit is set to “seconds” and snap is set to “Nearest” or “Prior”, clicking on the timeline anywhere except very close to a whole second plays the selection (or from the select cursor) instead of from the mouse cursor location on the timeline. I did get it to play from the mouse cursor location a few times from very nearly an exact half-second.
The zoom is as set by Ctrl-2.
OS: Windows Vista Home Premium SP2;
Audacity version: 2.1.2 or 2.1.3 Alpha Apr 28 2016. 2.1.3 is from the zip; I can’t say whether 2.1.2 is from the zip or the installer.