Hi Pheckphul.
Actually we don’t have problems to handle the middle mouse button on any platforms, so we can confirm that the problem in your case may be related to the Logitech T400, which we didn’t have the possibility to test.
When we talk about “middle mouse button emulation” we mean the behaviour that you can normally trigger by pressing left and right mouse buttons, which on Linux it is the same as pressing the middle mouse button.
This option is not available at the moment, but it is ready in our development version and will be released soon.