did you manage to figure out precomp+srep ( from commandline )
Code:
arc a -ep1 -ed -r -w.\ .\Disk\Data4.bin -x"%choice1%\Content\*" -x"%choice1%\__Installer\*" -x"%choice1%\*RU.dll" -mprecomp:+srep+exe+delta+lzma:a1:mfbt4:d256m:fb128:mc1000:lc8 "%choice1%\*"
if ERRORLEVEL 1 goto arcfail