While I realise Germany is not Australia, and Sain't row IV is not Falloout 3, my key when registered still defaulted to the censored AU version of the game on Steam. I think your caution is warranted.
The only reason I haven't bothered with it yet is I don't want the GFWL headache. The only other game I had with GFWL was Fable3 and that thing constantly gave me issues. I can't get that one to work at all now.
GFWL might have been removed on Fallout 3, no guarantees, but it's worth researching. If not, there might be a fix (in the case of Red Faction Guerrilla, I just had to drop a DLL file into the game folder to make it ignore GFWL).
I own SRIV, too, but in Germany the fourth installment is uncut. Where did you buy your SRIV key? On GamersGate, too? I guess I could live with a censored version if there's no alternative, but I wouldn't want to play the game in German. :(
EDIT: Hm, it appears they didn't remove GFWL in Fallout 3 after all. It might not be needed anymore and if it still causes problems there's a fix to bypass it, but it still seems to be part of the package.
EDIT2: I took the risk and bought it and it seems to be the uncut version, like Psyringe suggested, at least Steam gives me a choice regarding the language, and the cut version would be German-only. Now let's hope I get it to run on Win 8 without having to use GFWL.