[Nexus 7 Q&A, Help & Troubleshooting] tigrey:
Good news and bad news!

First, thanks for taking time to answer my cry for help ;) The effort was amazing.

Bad news being... it didn't work :/

I managed to mangle the INF into this:

;
; Android WinUsb driver installation.
;
[Version]
Signature = "$Windows NT$"
Class = AndroidUsbDeviceClass
ClassGuid = {3F966BD9-FA04-4ec5-991C-D326973B5128}
Provider = %ProviderName%
DriverVer = 05/24/2012,6.0.0000.00000
CatalogFile.NTx86 = androidwinusb86.cat
CatalogFile.NTamd64 = androidwinusba64.cat

;
; This section seems to be required for WinUsb driver installation.
; If this section is removed the installer will report an error
; "Required section not found in INF file".
;
[ClassInstall32]
Addreg = AndroidWinUsbClassReg

[AndroidWinUsbClassReg]
HKR,,,0,%ClassName%
HKR,,Icon,,-1

[Manufacturer]
%ProviderName% = Google, NTx86, NTamd64

[Google.NTx86]

;Google Nexus 7
%TWRPNexus7Recovery% = USB_Install, USB\VID_18D1&PID_D001
%bootloader% = USB_Install, USB\VID_18D1&PID_4E40
%ADBoff_MTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E41
%ADB_MTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E42&MI_00
%ADB_MTPoffNexus7OS% = USB_Install, USB\VID_18D1&PID_4E42&MI_01
%ADBoff_PTPoffNexus7OS% = USB_Install, USB\VID_18D1&PID_4E43
%ADB_PTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E44

[Google.NTamd64]

;Google Nexus 7
%TWRPNexus7Recovery% = USB_Install, USB\VID_18D1&PID_D001
%bootloader% = USB_Install, USB\VID_18D1&PID_4E40
%ADBoff_MTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E41
%ADB_MTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E42&MI_00
%ADB_MTPoffNexus7OS% = USB_Install, USB\VID_18D1&PID_4E42&MI_01
%ADBoff_PTPoffNexus7OS% = USB_Install, USB\VID_18D1&PID_4E43
%ADB_PTPNexus7OS% = USB_Install, USB\VID_18D1&PID_4E44

[USB_Install]
Include = winusb.inf
Needs = WINUSB.NT

[USB_Install.Services]
Include = winusb.inf
AddService = WinUSB,0x00000002,WinUSB_ServiceInstall

[WinUSB_ServiceInstall]
DisplayName = %WinUSB_SvcDesc%
ServiceType = 1
StartType = 3
ErrorControl = 1
ServiceBinary = %12%\WinUSB.sys

[USB_Install.Wdf]
KmdfService = WINUSB, WinUSB_Install

[WinUSB_Install]
KmdfLibraryVersion = 1.9

[USB_Install.HW]
AddReg = Dev_AddReg

[Dev_AddReg]
HKR,,DeviceInterfaceGUIDs,0x10000,"{F72FE0D4-CBCB-407d-8814-9ED673D0DD6B}"

[USB_Install.CoInstallers]
AddReg = CoInstallers_AddReg
CopyFiles = CoInstallers_CopyFiles

[CoInstallers_AddReg]
HKR,,CoInstallers32,0x00010000,"WdfCoInstaller01009.dll,WdfCoInstaller","WinUSBCoInstaller2.dll"

[CoInstallers_CopyFiles]
WinUSBCoInstaller2.dll
WdfCoInstaller01009.dll

[DestinationDirs]
CoInstallers_CopyFiles=11

[SourceDisksNames]
1 = %DISK_NAME%,,,\i386
2 = %DISK_NAME%,,,\amd64

[SourceDisksFiles.x86]
WinUSBCoInstaller2.dll = 1
WdfCoInstaller01009.dll = 1

[SourceDisksFiles.amd64]
WinUSBCoInstaller2.dll = 2
WdfCoInstaller01009.dll = 2

[Strings]
ProviderName = "Google, Inc."
SingleAdbInterface = "Android ADB Interface"
CompositeAdbInterface = "Android Composite ADB Interface"
SingleBootLoaderInterface = "Android Bootloader Interface"
WinUSB_SvcDesc = "Android USB Driver"
DISK_NAME = "Android WinUsb installation disk"
ClassName = "Android Phone"
TWRPNexus7Recovery = "TWRP Nexus 7 Recovery"
bootloader = "Nexus 7 Bootloader"
ADBoff_MTPNexus7OS = "ADB off, MTP on Nexus 7 OS"
ADB_MTPNexus7OS = "ADB on, MTP on Nexus 7 OS"
ADB_MTPoffNexus7OS = "ADB on, MTP off Nexus 7 OS"
ADBoff_PTPoffNexus7OS = "ADB off, PTP off Nexus 7 OS"
ADB_PTPNexus7OS = "ADB on, PTP on Nexus 7 OS"

I then went around into recovery and fiddled about with the MTP PTP settings after enabling devmgr to show hidden drivers. I uninstalled them all, then reinstalled them from the Asus R06 drivers with my ethernet link disabled.

When booting into the Nexus 7 OS with ADB on and MTP off, then installing the drivers, the description ADB on, MTP off Nexus 7 OS was seen in device manager, and the hardware ID was

%ADB_MTPoffNexus7OS% = USB_Install, USB\VID_18D1&PID_4E42&MI_01

Therefore, it installed properly.

But running cmd>adb kill-server>adb start-server>adb devices

yielded... nothing.

So, I rebooted into recovery, and "TWRP Nexus 7 Recovery" showed up in devmgr. But adb devices remained oblivious.

I think I'm lost to this cause :/

P.S- you mentioned MTP could do up to 80mbit/s? Mine is very slow indeed. I use a USB OTG cable to do any transfers, and it doesn't work with NTFS, even with Paragon NTFS/HFS+ root app :/

P.P.S- word of advice, Windows 8 is the most useless, horrendous, unusable and awful OS you could ever use if you don't have a touchscreen. 1) Hacky unsigned driver install leaves you open to attacks 2) Boots a useless 'Metro' start screen with crap app selection that eats memory. 3) Clearly doesn't work with Android out of the box. Or any other Linux OS for that matter. for the love of god DON'T. GET. IT.