Cmder inside Webstorm terminal
CMDER_ROOTto 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.
"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.