Just add a "[space]-intro" at the end of target in a shortcut (or in the launch options for Steam).

It should look like this: "C:\GOG\STALKER\bin\XR_3DA.exe -nointro" for SOC but works for the other two as well.

Saves some time if you're tweaking the game(s) for stability or mods.

It definitely works for SoC, but not CoP.

After a bit of searching I've stumbled upon a modified "game_tutorials.xml" file that's responsible for playing cutscenes in game. It seems that that way we can disable intro movies in CoP, leaving the rest untouched.

You can find it here - http://www.mediafire.com/?c4j2dow2ljg (courtesy of Bad_Motha from Steam forums)