So, if you want to go with an exploiter build, I'd recommend just taking the exploiter as it is on the forums. Lots of smart people have had input into that, it's tried and tested, and you should have good results with it.
If you're looking for something a bit different, you could instead try something more along the lines of the build below. It has a higher strength than you'll get with an exploiter, plus it makes good use of the extra feats. The weapon focus and specialization means you hit more often (against epic foes, at least) for more damage. Quickdraw means you don't lose as much time when switching weapons or using action boosts. Manyshot is still great DPS, good enough to justify the inclusion of Improved Critical Piercing.
With the outstanding action boosts available from Human Versatility and the Fighter Haste boost, the extra action boost from the Kensai gets a lot of mileage. There's nothing better than being madstoned, raged, hasted, with a +5 damage boost and a +20% speed boost all going at the same time.

The Oversized Two Weapon Fighting is really a bit superfluous. You could swap that out with another Toughness feat or something else to suit your taste.
I tried to build it with UMD and rogue skills, since that seems to be something you're interested in. I'm really not sure if this build will work in that arena, since that's not something I've done myself. My character is a 14 ranger/6 fighter. While I can see how UMD would be nice, I don't think it's strictly necessary as you still have a decent selection of spells available to you, plus Cure Serious Wands.
Character Plan by DDO Character Planner Version 3.5.1DDO Character Planner Home PageGimpler McStainyLevel 20 Lawful Neutral Human Male
(6 Fighter \ 2 Rogue \ 12 Ranger)
Hit Points: 340
Spell Points: 156
BAB: 19\19\24\29\29
Fortitude: 17
Reflex: 17
Will: 7
Starting Feat/Enhancement
Abilities Base Stats Modified Stats
(32 Point) (Level 1) (Level 20)Strength 17 27
Dexterity 13 18
Constitution 16 19
Intelligence 10 12
Wisdom 10 12
Charisma 8 10Tomes Used+2 Tome of Strength used at level 20
+2 Tome of Dexterity used at level 20
+2 Tome of Constitution used at level 20
+2 Tome of Intelligence used at level 20
+2 Tome of Wisdom used at level 20
+2 Tome of Charisma used at level 20
Starting Ending Feat/Enhancement
Base Skills Base Skills Modified Skills
Skills (Level 1) (Level 20) (Level 20)Balance 5 9 9
Bluff -1 0 1
Concentration 3 4 5
Diplomacy -1 0 1
Disable Device 4 22 23
Haggle -1 0 0
Heal 0 1 1
Hide 1 4 4
Intimidate -1 0 1
Jump 7 30 30
Listen 0 1 1
Move Silently 1 4 4
Open Lock 5 8 9
Perform n/a n/a n/a
Repair 0 1 1
Search 4 19 20
Spot 4 17 17
Swim 7 12 12
Tumble 5 8 8
Use Magic Device 3 23 23
Level 1 (Rogue)Feat: (Selected) DodgeFeat: (Human Bonus) ToughnessEnhancement: Human Versatility IEnhancement: Rogue Disable Device IEnhancement: Rogue Search ILevel 2 (Ranger)Feat: (Favored Enemy) Favored Enemy: UndeadEnhancement: Ranger Favored Damage IEnhancement: Rogue Sneak Attack Training ILevel 3 (Ranger)Feat: (Selected) MobilityEnhancement: Ranger Dexterity ILevel 4 (Ranger)Enhancement: Racial Toughness IEnhancement: Rogue Open Lock ILevel 5 (Ranger)Level 6 (Ranger)Feat: (Favored Enemy) Favored Enemy: ElementalFeat: (Selected) Spring AttackEnhancement: Human Improved Recovery IEnhancement: Ranger Energy of the Wild ILevel 7 (Ranger)Enhancement: Ranger Swamp Lore IEnhancement: Human Adaptability Strength IEnhancement: Human Versatility IIEnhancement: Racial Toughness IIEnhancement: Ranger Favored Attack IEnhancement: Ranger Favored Damage IIEnhancement: Ranger Tempest ILevel 8 (Ranger)Enhancement: Human Versatility IIILevel 9 (Ranger)Feat: (Selected) Improved Critical: Slashing WeaponsEnhancement: Ranger Dexterity IILevel 10 (Ranger)Enhancement: Human Versatility IVLevel 11 (Ranger)Feat: (Favored Enemy) Favored Enemy: Evil OutsiderEnhancement: Ranger Favored Damage IIILevel 12 (Ranger)Feat: (Selected) Power AttackEnhancement: Ranger Dexterity IIILevel 13 (Ranger)Enhancement: Ranger Tempest IILevel 14 (Fighter)Feat: (Fighter Bonus) Weapon Focus: Slashing WeaponsEnhancement: Fighter Haste Boost IEnhancement: Fighter Critical Accuracy IEnhancement: Human Greater Adaptability Constitution ILevel 15 (Fighter)Feat: (Selected) Oversized Two Weapon FightingFeat: (Fighter Bonus) Quick DrawEnhancement: Racial Toughness IIIEnhancement: Fighter Strength ILevel 16 (Fighter)Enhancement: Fighter Toughness ILevel 17 (Fighter)Feat: (Fighter Bonus) Weapon Specialization: Slashing WeaponsEnhancement: Fighter Attack Boost IEnhancement: Fighter Attack Boost IIEnhancement: Fighter Haste Boost IIEnhancement: Fighter Critical Accuracy IILevel 18 (Fighter)Feat: (Selected) Exotic Weapon Proficiency: KhopeshEnhancement: Fighter Toughness IILevel 19 (Fighter)Feat: (Fighter Bonus) Improved Critical: Piercing WeaponsEnhancement: Kensei Khopesh Mastery IEnhancement: Fighter Kensei ILevel 20 (Rogue)Enhancement: Ranger Sprint Boost IEnhancement: Fighter Strength II