Manual way:
1. Use unren
2. Run game once to decompile .rpy files then close game
3. Edit options.rpy
3a. Around line 35 change the config.developer and config.console to True (capital T is important)
3b. Add this code at the top of the file (fixes some bugs that trigger in developer mode only)
3c. Under the config.keymap['panic_screen'] line (around line 19) remove the shift + o from the list, or delete the whole line althogether.
Slacker way:
Uploaded my own working options.rpy if you cba to do it yourself. Extract the zip to the "GirlsInTheBigCity\game" folder.