You need to edit the file at:
/System/Library/Extensions/MicrosoftKeyboard.kext/Contents/PlugIns/MicrosoftKeyboardUSB.kext/Contents/Info.plist
This contains the USB matching information that match USB information for the device with which devices Microsoft's kext supports.
I added this dictionary entry to it [as a child entry of the 'IOKitPersonalities' dictionary:
<key>P063 Wireless Natural Multimedia Keyboard</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.microsoft.driver.MicrosoftKeyboardUSB</string>
<key>IOClass</key>
<string>MicrosoftKeyboardUSB</string>
<key>IOProviderClass</key>
<string>IOUSBInterface</string>
<key>bConfigurationValue</key>
<integer>1</integer>
<key>bInterfaceNumber</key>
<integer>0</integer>
<key>idProduct</key>
<integer>1</integer>
<key>idVendor</key>
<integer>3389</integer>
</dict>

I found the information needed for this using USB Prober, which is part of XCode [free download from Apple, also on System Installer DVD's].

This is the info that is displayed in USB Prober for my adapter:
Low Speed device @ 5 (0xFD110000): ............................................. Composite device: "USBPS2"
Device Descriptor
Descriptor Version Number: 0x0110
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol: 0
Device MaxPacketSize: 8
Device VendorID/ProductID: 0x0D3D/0x0001 (TANGTOP TECHNOLOGY CO., LTD.)
Device Version Number: 0x0001
Number of Configurations: 1
Manufacturer String: 0 (none)
Product String: 2 "USBPS2"
Serial Number String: 0 (none)



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