The Catalyst 10.10a drivers come with Morphological AA support, but it’s only enabled for the Radeon 6000 series.
As I initially assumed, it can also be enabled on the 5000 series.
To do that, first get the file provided here: MLAA inf file .
Make sure you unpacked or installed the CCC driver.
Then unzip that file from the link and then go to
“C:\AMD\Catalyst_8.782.1RC5_Win7_MLAA_Oct21\Packages\Drivers\Display\W7_INF\”
and to
“C:\AMD\Catalyst_8.782.1RC5_Win7_MLAA_Oct21\Packages\Drivers\Display\W7_INF\”
and replace the C7106976.inf in these locations with the new one.
Now reinstall Catalyst directly from \Packages\Drivers\ and reboot.
You should have the Morphological AA option in CCC:

Enjoy !
-Later Update-
On the more recent sub-version of the driver the file is named C7107195.inf.