I think I've figured out a DONE4 route that works and has availability, but when I use the oneworld tool it thinks I'm trying to book a Global Explorer and tells me I've passed the mileage limit:

OSL - xDOH - oCMN - xDOH - oSIN - oHKG - oAKL - xSYD - xLAX* - oJFK - xMIA - oSJO - xDFW** - oHEL - OSL

* AKL-SYD-LAX-JFK not bookable as one ticket, but layover at LAX is < 24:00 (3:00)
** SJO-DFW-HEL not bookable as one ticket, but layover at DFW is < 24:00 (21:30)

Is it the tool? Do I have to call AA and feed every flight to an agent?