Just to reiterate for the audience: you already rely on the DM for Mage Slayer (as mentioned in the OP) and the Flurry of Blows <-> Decisive Strike equivalence (totally reasonable).
Occult Opportunist is the name of the Dragon feat.
Other possibilities: Close-Quarters Fighting (vs grapplers), Hold the Line (vs chargers). Yes, they're situational but worth mentioning.
Oh, and for remembrance's sake:
On a note unrelated to casters, can anyone here think of any monk weapons that have reach? If so I'm thinking that starting as a monk could actually be better for the original lockdown if they use the decisive strike alternative from PHB II.
The fighter version of the build is really most effective after level 16 because of the double damage on AoOs making the Stand Still DC so high. If a monk could get a reach weapon (or make his extend his reach with unarmed strikes by a fair bit) he could make the build come into its own a lot sooner. Maybe a monk1/psychic warrior X? Dunno since I've never played psychic warriors before, but it's an idea.
@gabrion : I tried doing it some pages back, but I spent only 15min on it and the resulting BAB was poor ; Warmind may be a better idea (it's especially great with Tashalatora, but that's setting-specific).
I thought I had mentioned Decisive Strike first, but in fact it was Radical Taoist - damn his genius !