New Computer: Dumb SLI Questions

I received my new machine yesterday, and have been setting things up.It has two GTX570 cards in SLI. My understanding is that SLI is (probably not?) beneficial for FSX. When you run games where you want to disable SLI mode, do you toggle out of SLI in the Nvidia control panel or do you simply set up a profile for that particular game with SLI disabled (if so, how?)One thing that is irksome for me is that I have three monitors (two primary plus a Wacom Cintiq). It seems as though I have to disable SLI in the control panel in order to enable all three monitors. This is a bit irksome, because to re-enable SLI I have to unclick the third display under "Set up Multiple Displays", wait for things to refresh, then go to the "Configure SLI" tab and enable SLI and wait for things to refresh. Are there any utilities that make this process a bit quicker and easier? it surprises me that Nvidia doesn't let you set up monitor profiles that you can select via the toolbar.Thanks in advance.