Some Ideas
Take 2 (in which I hope my browser doesn't hiccup and drop about 15 feat synergies into the abyss. Here's hoping I remember them...)
Lightning Reflexes and Dodge = +1 to both feats' modifiers
Iron Will and (Slippery Mind or Still Mind class abilities) = +1 to both feats' modifiers
Great Fortitude and Toughness = +1 to both feats' modifiers
Steady Hands, Dex 19+, Point Blank Shot, Weapon Focus: (any Ranged Weapon) = increase maximum range of precise attack damage (like Sneak Attack) from attacks with Focussed Weapon by 50%
Quickdraw, Lightning Reflexes, and Combat Reflexes = may draw a weapon and make an AoO (I don't think the other two are enough by themselves.) If done, may not make another AoO this round, nor use Opportunist ability this round.
NEW FEAT
Strike From Surprise
Prereq: Quickdraw, Lightning Reflexes, Sneak Attack ability, Improved Feint, and Two Weapon Fighting
Attacker may draw a weapon and make a melee sneak attack (at current BAB) with it as a use of Opportunist, an attack, or as an AoO. This may only be done once per combat to a particular defender, and this attack and all further attacks incur all normal Two Weapon penalties for the remainder of the round. If that defender survives and warns others, this ability may not be used on them at all. This feat gives a +2 synergy bonus to Feint attempts.
Take 2 (in which I hope my browser doesn't hiccup and drop about 15 feat synergies into the abyss. Here's hoping I remember them...)
Lightning Reflexes and Dodge = +1 to both feats' modifiers
Iron Will and (Slippery Mind or Still Mind class abilities) = +1 to both feats' modifiers
Great Fortitude and Toughness = +1 to both feats' modifiers
Steady Hands, Dex 19+, Point Blank Shot, Weapon Focus: (any Ranged Weapon) = increase maximum range of precise attack damage (like Sneak Attack) from attacks with Focussed Weapon by 50%
Quickdraw, Lightning Reflexes, and Combat Reflexes = may draw a weapon and make an AoO (I don't think the other two are enough by themselves.) If done, may not make another AoO this round, nor use Opportunist ability this round.
NEW FEAT
Strike From Surprise
Prereq: Quickdraw, Lightning Reflexes, Sneak Attack ability, Improved Feint, and Two Weapon Fighting
Attacker may draw a weapon and make a melee sneak attack (at current BAB) with it as a use of Opportunist, an attack, or as an AoO. This may only be done once per combat to a particular defender, and this attack and all further attacks incur all normal Two Weapon penalties for the remainder of the round. If that defender survives and warns others, this ability may not be used on them at all. This feat gives a +2 synergy bonus to Feint attempts.