In Chesters' 1st post there is a link to the RomeTotalRealism.org post where he obtained his information. If you go there you will see that Spurius who wrote it also has a link to a former topic. If you go to that link, you will find a post at the very end which explains the easiest way to enable this in your icon target line. Basically, you can change it to the following for just playing the game(you can skip the "-enable_editor" part). Make sure that you have the game directly in the Activision folder and not some other one you have created.
C:\WINDOWS\system32\cmd.exe /C "start /HIGH RomeTW.exe %1 %2 %3 %4 %5 %6 %7 %8 %9"