Such a mod can have a neutral picture with 10+ bits and 4:2:2 maybe.

A similar mod, would be to output raw video frames to a flash drive via USB (3).

• I need it to have 7+ USB ports, a strong power supply (must be able to drive 2 HHDs and keyboard/mouse), be reliable, compatible with USB 2.0 (also on the computer side) and all USB devices.

• It would be nice if it can be wall mounted (I want to put it on the lower side of my desktop), the power supply is internal (or at least small), the USB ports are not all on one side, an on/off switch and a status LED (not 20 flashing LEDs, just one;-).

Especially for Mac users it looks like a hub with the VIA VL812-B2 is needed to be 100% compatible (the older VL812 might be ok too). It also seems that most of the USB hubs are just rebranded cheap generic boxes as you can find so many (visually) identical hubs with different brand names on it.

Some examples:

A bit too expensive and old chipset, but nice housing: https://www.amazon.co.uk/LINDY-USB-Industrial-Port-Metal/dp/B00DE5YARW/

Also too expensive and does not work with HDDs when using a Mac(!): https://www.amazon.de/EXSYS-EX-1188HMS-Netzwerk-Hub-7-Port-USB/dp/B00B01AMPQ/

Plastic, no mount, but cheap, new chipset and 2 ports on top with extra power: https://www.amazon.co.uk/ClimaxDigital-CHUB307-Charging-Adapter-Warranty/dp/B00EWO1KE0/ (This one looks quite good, but I haven't found it anywhere in Germany with the correct power plug.)

It seems quite hard to finde a good USB 3.0 hub, so any input/help/experience is highly appreciated.

This is a first, a capture box that allows full 1080p 60fps capture. The supplied software only goes up to 30mbs in MP4, but you can record the live view using other software in full uncompressed video. Sucks that you need to tether it, but it looks like it's USB powered so you could take it out on the road and record with a fast laptop.

The gameplay capture scene has been advancing fast. As little as 3 years ago there was really only one player in the market(Hauppauge). Now there are 2 more major players, Elgato and Avermedia, the latter just upped the ante, and for only $180.
http://www.amazon.com/AVerMedia-ExtremeCap-U3-Capture-Uncompressed/dp/B00G9QTUVE/ref=sr_1_1?s=electronics&ie=UTF8&qid=1386491687&sr=1-1&keywords=extremecap+u3

EDIT: After doing some more searching I found this, XCAPTURE-1: http://www.solarisjapan.com/xcapture-1-usb-3-0-hd-capture-unit/?setCurrencyId=1 That can also do full HD at 60fps capture, but it's twice the price of the U3. It's main benefit is it can also capture various SD resolutions with various SD connectors, the Avermedia only has HDMI. This guy did an in depth test of the XCapture in various resolutions from SD to 1080p 60fps. http://www.sixfortyfive.com/streaming/xcapture1.html