I'm utterly disappointed by your attitude on this issue. Even though the need for a mid-mission save is clear as day, and that many people have posted countless plausable reasons for it, how can you turn a deaf ear and avoid including such a feature?
If you are not going to listen to people's sincere suggestions, why do you have a feedback thread in the first place?
If people want to make the game easier for themselves, why not let them be? You may be making the game, but it is up to the gamers to decide how to have fun. If you really cared about all the people supporting this game, there were plenty of ways you could implement such feature, ie. an option at the very beginning of a single-player game?
You don't care what people think at all. None of our opinions or wishes have any value to you. Soon some people will say you can take your game and play yourselves. Your arrogance will be the downfall of this great project.
Having said that, i'm sure you will soon lock this thread and maybe even delete my post and my membership.