I'm afraid not. If you need bandwidth control feature, you should buy a different model like TD-W8970. http://www.tp-link.com/en/products/details/cat-15_TD-W8970.html#specifications

Is it a problem with your Alliance as you said the router is working fine with other connection? Did you contact your ISP?

Upgrade the latest firmware directly. There are new Modifications and Bug Fixes in a newer firmware... You can downgrade it to 141013 if the notes didn't say that you cannot do it...

Try the driver for Window 8.1. http://www.tp-link.com/en/download/Archer-T4U_V1.html#Driver

Install the latest driver of T2U for Windows 8.1. http://www.tp-link.com/en/download/Archer-T2U_V1.html#Driver

IP Qos refers to bandwidth control based on IP address? Can you give an example to explain what you are trying to fulfill? There are many models can do what you want. You can check the specification...