Two new feat idea
Relentless: (Fighter) Pre Req Combat Reflex: If an opponent withdraw form a square you threaten you many take an AoO again them.
(normally the first square is free)
Juke: (Fighter) Pre Req Combat Expertise, INT 13, Improve Feint: Any time you Feint some one in combat you get +1 Dodge Bonus to AC for every 5 that you beat them by vs that opponent. Till your start of your next turn.
First one already exists in the game - it's a Duelist class feature.
No Retreat (Ex)
At 9th level, enemies adjacent to the duelist that take a withdraw action provoke an attack of opportunity from the duelist.
Second one is not a good idea - a combat bonus should never scale with your success on a skill check, because it's really easy to pump skills to ludicrously high levels. 3.5 had a few abilities that worked like this (Knowledge Devotion being one, if I remember correctly) and they got abused to hell and back.
Skill race and combat is all ready acrobatic, escape artist, sense motive, & intimidate all are used In combat. I think there few feat get better if DC 5 for intimidate.