I've finally found the solution working for me after two month going crazy on this problem (R9 290 I7 4770 Windows 7 64 bits, drivers 16.2.2), you have to instal Microsoft .NET Framework 4.6.2, then the additional settings finally open (but are lost the settings that i used to ad 24Hz profile on my VP Sony so i will try to downgrade)
Yes, times change. I can't access it anymore either. But.. It's possible that installing an older version of the driver might help.
There used to be programs that supplemented the ATI drivers (eg. Rage3D Radeon Tweaker, ATI Tray Tools..) that MIGHT still work. Don't hold your breath though.
Even in the same version one of my friend was getting the additional
settings in preferences tab but the same is not showing in mine.
Else how can i specify an application to run on my discrete gpu instead of