I really don't think Invisible Blade is worth it, even the 10 level version, as I'm sure the errata that you can only free action feint once/round applies even to that "unofficial" version. And the int to AC is worthless and I really hate having SA progression limited ONLY to dagger type weapons and melee. If you want "free" action feinting, get Improved Feint feat and be a caster/rogue combo (using Unseen Seer from C.Mage and Arcane Trickster from DMG to make it work). There's a level 1 spell called Insightful Feint in the Spell Compendium. Swift action to cast, and if you have the feat, makes feinting a free action that round (still only for one feint, I think).
I never liked feinting at all, though. The fact enemies add BAB and actual skill bonus made it supremely unattractive to me, and the whole one attack/round thing is just the turd-y icing on the garbage cake. Just get flanking. Summon Monster and even better the Persistent Blade (Spell Compendium) spells or wands work wonderfully. And if you do a Swordsage dip (I love doing that as a rogue), Distracting Ember as a swift action. If you have melee allies, flanking is even easier, of course.
So, rolled stats...was it a 17 dex raised to 18 at level 4? Just curious. If he can do a complete retrain:
*Get rid of ALL of his feats, they're all bad, sorry. New low level feat wish list: Craven, Two Weapon Fighting, Staggering Strike, Weapon Finesse (see below), Daring Outlaw (see below)
Change to Str 11, Dex 18, Con 14, Int 11, Wis 10, Cha 16. That's assuming he is emphatic about being a "player" if you know what I mean. Otherwise, give the 16 to Con or Int, give the 14 to whichever of those two didn't get the 16, and a 11 for Charisma. I must say...his rolled stats are extremely inefficient for a multiple ability dependent class like rogue. They're much better caster stats (18 in casting stat, 16 in con, who cares about the rest?) On the plus side, if he's willing to do Rogue/Caster, he can just make Dex and the casting stat his highest and fare pretty well.
*Class build: At least 3 in Swashbuckler, at least 4 in Rogue (Uncanny Dodge...accept no substitutes). I like to dip Swordage 2 levels at levels 9-10, but that's fully up to you and what you can get away with without xp penalties.
Swash gives you a d10 HD and full BAB, but will crush your skills. Advance high in this if he mostly wants to melee stuff. 3 levels gives you Weapon Finesse as a bonus feat, Intelligence to damage (STRONGLY consider dropping cha to have higher Int), and probably something else I'm forgetting. The Daring Outlaw feat lets you treat these levels as rogue for sneak attack progression, so if you don't care about being skillful, you lose basically nothing by staying swashbuckler. Myself, I think the d6 HD and medium BAB is worth the rogue class features...
Scout: It's an ok class, it can't compare at all with a rogue for damage, generally. If you're making a melee scout, you basically want pounce and to make a charge build. The easiest way to get pounce is Lion Totem Barbarian 1 (C.Champion). I really don't see the point in a Spring Attack scout. if you're just going to try and keep away from melee and make a single attack each round, why not just be a ranged scout to begin with? At least a ranged scout has options to full attack skirmish and still avoid melee. Just find ways to move 10 ft without spending a move action. Allied spellcaster casting Slide on you, Boots of Sidestepping, Chronocharm of the Horizon Walker (which you can explicitly wear many times to get multiple uses/day), Travel Devotion feat with a Cleric dip...
