Note this involves editting a game file, so make a back-up before proceeding.
Look for the progress.dat file in the ...\dreamcatcher\emergency fire response\save directory. Use a text editor to open and edit that file and change the number on the Progress line to 9, and the number on the line Star to 5, which will give you 5 medals for each scenario.
Then type Star 2 to 9 under each line, exactly as the first 2 were written, adding the number 5 at the end of each line. Save the file (as a *.DAT file) and you're done.