Update (April 2015): This probably wont work anymore for anyone without an ISP that has Earth Telecom routing (maybe not even with that). Try and see if it works, and if doesn't then just remove the entries from the hosts file and download the games normally.
If you aren't already getting BDIX speeds on your BDIX connected/uncapped ISPs while downloading games through EA Origin, try this:
Open your hosts file from C:\Windows\System32\drivers\etc\ with Notepad (run as administrator) and add these lines at the bottom.
Save the file, restart the pc if you want, check to verify if pinging akamai.cdn.ea.com returns one of the IPs from above, and then download games from your Origin library at BDIX speeds.
Note: If your download stops working after doing this, but used to work fine before, just open the hosts file and remove those lines.
Update (November 2014): It stopped working with Link3 and BDCom Smile. Other ISPs still might work. Confirmed still working with AntarangaBD.