the shortcut that steam installs goes thru the steam Dll. RMB on it and look at its properties points to steam not GG.
Open file explorer and find the gameGuru.exe file in the location I mentioned above and make a shortcut from that.
You will not be calling the steam dll and then Game guru will be running on its own. But there will be no MP in this way.
Now if you are running steam and you use the short cut you just made, you should see that you may be online with steam, but it should not show that you are playing GameGuru.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit