No, multi boxing is not allowed but having two accounts is not. I trade regularly between accounts. There's no suggestion in the terms and conditions that this is not OK. Go ahead.
But Milly's Harvest and the like can take hours. Literally. The dwarf start area took a friend 105 minutes to collect the three refugee items. The eggs in the Nelf area, the bundles of wood in the Elwyn. All these can and are infuriating.
Me too, it makes the game practically unplayable unless you have a pair of spare mages at either end of each run.
Is this a problem that's being addressed? If so, time estimate, it's not then....