I've been playing the XCOM reboot on Steam recently (my brother apparently gifted me his copy); and one thing that would be a very desired feature for Open XCOM after 1.0 is this:
Automatic Skyranger Squad Adjustment Option
When toggled ON, after each mission, have the game juggle in and out troopers according to some parameters you set (how many veterans do you want in a squad, etc) so that you have a fresh rotating mixture of rookies/lower ranking soldiers and old hands on each mission, instead of five really good guys getting all the kills; and thus leaving you boned if you lose them.
Yes, you can do this all by hand in the Original XCOM, Open XCOM, and the XCOM Steam Reboot; but it gets a bit tedious.