Reaction-chance is proportional to your TUs as well as your Reactions. If you don't move a guy on a turn he's way more likely to get a reaction shot in, unless his Reactions is exceptionally low.
You didn't read my post. All my guys were at full TU because the previous turn i had MC the alien to trap it in a corner (not literally a corner, but a section of the ship where all he can do is walk around back and forth in front of my troops). None of my guys had moved for 2 straight turns.
I just would like to request it to behave similar to vanilla. One of the most fun parts of vanilla was watching the hail of laser + plasma fire when an unsuspecting alien would walk out of the door. Those fun "moments" don't happen anymore.