As you can see, Improved Feats, granted in Modern20 core by Occupations, are also granted by martial arts styles. You still have to take the feat, it just works better for certain MA styles.
As always, questions or comments welcome.
Martial Arts Style
Boxing can be definitively traced to the Ancient Olympic games as far back as 688 BCE, although its origins are doubtless much older. As with wrestling, boxing appears to be an almost universal activity in the ancient world for both combat and sport. Modern competition boxing bears little resemblance to these ancient matches, in which no protective gear was worn, no time limit was imposed, no score was kept, and matches sometimes lasted over twelve hours, continuing until one combatant could no longer stand or fight. Boxing, in its modern form, dates back to the 1904 Olympic Games in St. Louis. Some Boxers refer to themselves as “sluggers,” “dancers,” or “pugilists” and many affectionately refer to their sport as “the sweet science.”
Prerequisite: Combat Martial Arts or Defensive Martial Arts
Unarmed 4 ranks: Lightning Jab: when using the Fast Punch perk, you can render an opponent flat-footed once per encounter. This ability renders targets with the Uncanny Dodge feat flat-footed as well.
You may use this ability additional times in an encounter by spending an Action Point.
This ability may be combined with the Crippling Strike, Critical Strike and Sneak Attack feats.
Unarmed 8 ranks: Attack Focus (unarmed): +2 to attack rolls
Unarmed 12 ranks: Power Hook: When using the Power Punch perk with unarmed attacks, your Strength modifier is doubled, rather than the usual increase of 1.5.
Unarmed 16 ranks: Attack Specialization (unarmed): +3 damage
Unarmed 20 ranks: Strength Training: +2 Strength