Did you test the light flail in off-hand as well? Medium characters can't wield flails, whips or morningstars in their off-hand because the game is missing graphics for that. I'm not sure if it works with large chars though.
you can try what I did and you will have enough feats. I went 9 ranger 1 paladin 30 wm. sure you don't get fear immune but that is easy to cover, and you get disease immune, free improve 2 hand attack, and a minor ac bump when dueling from ranger. dualing should put you around 120+ish ac.
9 levels of Ranger gets you 3 feats (twf, ambidexterity, itwf) 8 levels of Fighter gets you 5 feats (levels 1, 2, 4, 6, 8) - so going the ranger route doesn't give you extra feats.
I was hoping making a Uni tank WM would make me want to play the class again, but the best way to build one seems to be with a medium character as you get 1.5x STR mod with a large weapon, which makes up for only having 6 attacks per round.
As mine's a Juggernaut and my only other BUR options on that playername are Brownie or Maelaphant i'm stuck with large or small (no chance of using a 2 hander for the extra attacks sadly).
AA just has a lot more going for it - 7 attacks per round, focused damage (can choose the right damage for each mob), no need for weapon buffs, can have high DEX and STR to avoid KD and dish out nice crits with Devastating critical... and can dish out all that damage from a safe distance.
Universal STR WM By selecting Club, multiple weapon types are available (one / two handed / double / piercing / bludgeoning / slashing)
pros: shouldn't have too many problems with STR and DEX stat checks Dev crit, EWF and LWF(extra attack) myriad of CEP weapons Crit immune for ~7 min starting at lvl 50 131AC with light armor and small or large shield (135 with girding) 127AC with medium armor and shield (131 with girding) 126AC with heavy armor and shield (130 with girding) saves of 63f 65r 63w 6 attacks per round 100 AB rona & int arti friendly saves (BG not Pal)
cons: no class based conceal (beg buffs or use rona boots for displacement) Relatively low hp (1042)
race elf subrace undying
"Undying" (secret Beyond UltraRare) - Never Gets XP Penalty - STR +2, DEX +2, CON +4, INT +2, WIS +2, CHA +2, free feat: Dodge, free feat: Luck of Heroes, free feat: Great Fortitude, free feat: Iron Will, free feat: Lightning Reflexes - Undying receive +3 skill points per legendary level.
I read that He wanted to get the 1.5x Str mod but Juggernaut is large - Undying is not - and that he was shelving the build for its weakness relative to his dev crit aa build. As to what "it doesn't" refers to... could you lilluminate?
The whole club focus thing is a temporary measure until the CEP weapons are coded, I'd be careful about assuming use of multiple weapons from this or you'll be dissapointed when it gets changed (probably a week after you've reincarnated).