I have exactly the thing you speak of and I use it quite a lot. I use batch file method, here is my code:
taskkill /f /fi "imagename eq gta-vc.exe"
taskkill /f /fi "imagename eq gta_sa.exe"
I set the hotkey to CTRL+ALT+Q.
Note that the command "taskkill" will most likely not work in non-English version on Windows.
:ps: I just remembered you made a topic about this a long time ago, I responded with several batch file methods:
http://www.argonathrpg.eu/index.php?option=com_smf&Itemid=28&topic=2310.msg18391#msg18391This is the last two posts of that topic where by you attempted to make a batch file:
Im going to try this. Thanks.
EDIT: Dosent work 
It start but it dosent affect the VC program.
Thats because your Windows is Swedish. If you want this to work, you must use the Swedish equivalent of the taskkill and any other commands i displayed. 
I told you before the same thing I am telling you now, get the Swedish command equivalents if you want to use batch file method.