I am running Studio One version 3.1 on an 8-core (2.26 Ghz) 2009 Mac Pro with 24 gig ram, operating system is Yosemite (10.10.5), audio interface is the Focusrite Saffire Pro 24 (sorry, driver version unknown - I am using the driver that came with the device when I purchased it this past spring from Sweetwater.com).
According to the Studio One 3 manual (dated 10/12/2015) on page 84, it clearly states that pan and volume automation is included in the Track Transform feature when going to rendered audio (in this case from an audio track with effects and pan automation on it). However, after extensive experimentation, this does not appear to work. It does do the effects without any problems, but I have verified that it does not do the automation.