Slitherine

1) How to unlock all units from the start of the campaign? Is there somewhere a text file or something that I can edit?

I want to try and play normally and retain my units through the entire campaign, and not be forced to sell my imperial guardsmen at the end of act 1 to exchange for space marines and titans. Keeping squads alive through act 1 and earning that experience seems meaningless when i have to sell them. (I dont like imerial guardsmen, I would like to try and play with a pure space marine list)

2) How to disable turn limits on missions? Is there a file to edit?

On hardest difficulty some missions are very very difficult unless you cheese it with 5-6 titans. I want to play with normal space marine squads, no arty, but it takes a lot longer to clear mega nobz and orc heavys without titan cheese.

I know how to unlock all units for the Steel Legion, but I don't know how to unlock space marine units before act 2.

If you look in the "data" folder inside the game folder in steam you'll see a list of files. Find the ones named avail#. Copy/paste the highest number one and rename it to the one you want to replace (or used notepad++ to copy/paste the contents of the highest number one into the lower number ones).