I've had duel wield and double attack working for a while in my modified version, just a matter of adding another attack timer. It's not very refined though, I don't think it even takes your skill into account!
I just stuffed in some formulas from Monkly business for the damage calculations and percentage chance of DA/DW and it works pretty well, specially when you add 100% haste and monk epic fists
I might go and tidy the stuff up at the weekend and post the changes somwhere. I'm not affiliated with the dev team at all though, and I know Image is doing his own combat system (which is bound to be much better than my hacks
so I doubt anything of mine will end up in the official Emu.
K.