Whoops, I forgot that you need to setup the key configurations manually through the "config.cfg" file.
If you go to the "esforces" folder, there should be a file titled, "alpha2.0_steam_compatible.rar". Open it and look for a file named, "config.cfg" and extract it to your "esforces" folder. It'll ask if you want to overwrite, select "Yes". Now, your keys should be set up properly.
However, if you wish to change any of the key assignments, you have to do it manually through the "config.cfg" file.