This is a GUI for SweetFX written by Lazer specifically for RoF, and it's pretty cool.
http://riseofflight.com/Forum/viewtopic.php?f=278&t=34103 (http://riseofflight.com/Forum/viewtopic.php?f=278&t=34103)

Here's some tips for tuning the SMAA:
http://forums.guru3d.com/showpost.php?p=4378263&postcount=740 (http://forums.guru3d.com/showpost.php?p=4378263&postcount=740)
When setting custom values, consider the values used in the presets:
The SMAA presets define these values :

Code:
LOW:
#define SMAA_THRESHOLD 0.15
#define SMAA_MAX_SEARCH_STEPS 4
#define SMAA_MAX_SEARCH_STEPS_DIAG 0
#define SMAA_CORNER_ROUNDING 100

MEDIUM:
#define SMAA_THRESHOLD 0.1
#define SMAA_MAX_SEARCH_STEPS 8
#define SMAA_MAX_SEARCH_STEPS_DIAG 0
#define SMAA_CORNER_ROUNDING 100

HIGH:
#define SMAA_THRESHOLD 0.1
#define SMAA_MAX_SEARCH_STEPS 16
#define SMAA_MAX_SEARCH_STEPS_DIAG 8
#define SMAA_CORNER_ROUNDING 25

ULTRA:
#define SMAA_THRESHOLD 0.05
#define SMAA_MAX_SEARCH_STEPS 32
#define SMAA_MAX_SEARCH_STEPS_DIAG 16
#define SMAA_CORNER_ROUNDING 25

Good stuff there