Shouldn't we present the option of using the DS3 as a Dinput controller through this wrapper: http://forums.pcsx2.net/Thread-Dinput-Wrapper-for-SCP-Driver ? It's really handy for those playing mame and other emulators that don't support Xinput so well.
Topic on Controller talk:DualShock 3
I personally own Mayflash adapter which has a switch for this so I don't need to think about this personally, but doesn't SCP basically make the controller seem identical to wired 360 controller, meaning that it also works with DirectInput only titles as legacy mode kicks in?
If not, then most certainly it should be covered on the page. Also as you can see on topic below, there was discussion could that be used to emulate Dualshock 4 so games would automatically give proper button placements and prompts with newer titles, but that haven't gone forward at all it seems :\
Sadly I don't think there is any legacy mod for DirectInput only titles. Let's hope the DS4/X360 switch that you refered to can be implemented so then we could theoretically play all games.