Are there any other official feats that allow you to subtract from your To-Hit modifier in order to add to another modifier?  I'm aware Kingdoms of Kalamar has a sort of "reverse Power Attack" feat to trade damage for accuracy, but I'm specifically looking for abilities that trade out To-Hit modifiers.

This is for purposes of a feat for a shield-specialist.

What feats, if any, can improve upon a Forestlord Elf's Treewalk ability?

I'm sure this has been thought of and discussed before, but a quick Google check didn't bring up relevant results.  It seems like it might add a bit more luster to the Fighter's portfolio.

The concept is a "Thieves' World" game, wherein one side of the gestalt is free-for-all, while the other has to account for any LA and have gained Trapfinding by 10th level; akalsaris had a decent little resource on how to do that over at the old boards.  Evil characters and non-WotC materials are disallowed.

So, the question is: What does the hivemind consider appropriate challenges for a group of 5 such 10th level PCs?  Standard "get phat loot" runs for a thieves' world campaign are both trite and trivial at this level, to my senses.  If it helps, consider the group as Warlock//Spellthief, Psion (Egoist)//Factotum, Warblade/Bloodclaw Master//Barbarian w/ Trapfinding ACF, Duskblade/Chameleon//Artificer, Dragon Shaman//Cleric w/ Kobold domain.

For ease of reference.

Gnome pilot:  RIP
Hobgoblin co-pilot: RIP
Minotaur sheriff: RIP
Josiah, male Human blacksmith
Toosa'inya, female Elf healer
Olgier, male Wild Dwarf
Margier, redheaded male Wild Dwarf
Fridigier, white-haired male Wild Dwarf
Eurig, male Razorclaw Shifter who worships Balinor
Dilys, female Gorebrute Shifter and member of the Ashbound druidic sect

The staircase heading down has wide, shallow steps that are well-suited to short legs.  The steps are made of a greenish stone with black flecks, polished smooth with slight but obvious grooves where repeated trips up and down are starting to wear.  The air from the tunnel of the staircase is notably hot, particularly compared to the chilly air under the Osa sky.

Preamble: I'm familiar with akalsaris' Poison Handbook.

Given a race with Poison Use and Favored Class: Barbarian, how would you go about making an "archetypal" barbarian to represent their culture?

I'm just clarifying something here, as it's possible I'm overthinking it.

Ghoul Touch specifies that it paralyzes one subject, and sickens those in its radius unless a Fort save is made.  Does it allow a Fort save to prevent the paralysis, or no?  That would make it a rare 3.5 spell that both requires an attack roll and allows a save, but it wouldn't be the only example.

The Gate Zeppelin comes out of the Astral Plane, to the world its passengers were calling 'Osa,' a mite lower and a good stretch faster than the Gnome pilot anticipated.  Faced with a sudden increase in resistance and a fast-approaching copse of some evergreens, he yanks back at the controls to try to force elevation.  This causes a momentary dip of the Zeppelin's tail end, which clips the treetops, tears loudly, and erupts in an otherworldly green flame.

The pilot forces the Zeppelin down in a clearing as the flames spread, and the passengers are quickly ushered out; folks are quick to get all their important supplies out safely and efficiently.  Only the pilot and his Hobgoblin co-pilot, along with a single minotaur passenger, die in the crash.

* * *

The clearing you're in is roughly two hundred meters square, with a slight rise to the port side of your wrecked Zeppelin.  Aside from the smoke and the flames, the air seems clear and cool, at what your research would have you believe is 'summer' weather.  The sky is cloudless and periwinkle blue, with a single daytime star visible overhead, and two small yellow moons at opposite points on the horizon.  The ground itself feels springy, not too dry, and oddly warm under your feet, given the temperature of the air.

Friendly discussions and planning of actions go here.