You can use a pill on a mining rig while it is equipped to inject the contents into yourself

Using a pill on a mining rig while you are wearing it now injects the contents of the pill into you and disposes of the pill. 

This was mostly to get around the fact that you can no longer chomp on stim pills while in a vaccuum due to recent changes, making them a fairly pointless mining item, this fixes that; But has other uses potentially for other servers (Starving or Dehydrated due to cave-in? Nutriment and water pills! Muh immersion!)