SinvalMAO

1. Set an environment variable called CMDER_ROOT to your root Cmder folder (in my case C:\Program Files (x86)\Cmder). It seems to be important that this does not have quotes around it because they mess with concatenation in the init script.
2. In your IntelliJ terminal settings, use "cmd" /k ""%CMDER_ROOT%\vendor\init.bat"" as the Shell path. The double-double-quotes are intentional, as they counteract the missing double quotes in the environment variable.