Add "bash.exe" to Total Commander's panel. Press right button on icon, then menu "Change..." (Изменить...). Fill field "Parameters", enter:
--login -i -c 'cd `cygpath $*`;bash' bash %P
OR
Place bat file where you want to open cygwin console and put down next script:
cygpath -u %~dp0 > tmpFile.ololo set /p CUR_PATH=<tmpFile.ololo del tmpFile.ololo bash --login -i -c 'cd `cygpath $*`;bash' bash %CUR_PATH%