Battle.net.4336
Code:
000F70F2: 8A > B1
000F70F3: 4D > 01
000F70F4: 0B > 90
Not sure if the way the offset was derived was the right way (looked for the pattern:
9E 00 8A 4D 0B 8D 46 68 85 C0 74 07 8D 78 98 8B = ž.ŠM..Fh…Àt..x˜‹
in the "000F" offset), but the feature seems to be enabled either way.
+1 Rep to TOM_RUS by the way 
Alternatively this is the edited corresponding file for ease of use

You just place this *.exe in your
"*\Battle.net\Battle.net.4336" folder and replace your existing one.
Download
*.exe
Virus Scan:
Note: Use at your disgretion, if you don't trust it, don't use it.
Also as TOM_RUS said, I'm not responsible for any actions Blizzard may take against accounts using this. Use at your own risk!