I could never shoot Ash or Virmire Survivor for that matter. That's just sociopathic to the 8th degree.
In the original script there was a moment where you had to choose between saving the Virmire Survivor or saving Liara.
Very tough, I don't know what I would have done. Liara can be a bit much, but I really do like her, even when I don't romance her. And I always have a connection to the VS, and especially if I romanced Ash, obviously.
It would have been an incredibly emotional moment if BioWare would have kept that choice. Tears would have ensued.
Also, the level of hate for Kai Leng would have gone off the charts-It's lengs Fault in the Original Script.