Options that I use and find important to multiboxing (for QuestHelper):

/qh perf value
Scales the CPU workload for QuestHelper's route calculation routine. Will accept a number or a percentage, in the range 10-500% (although we don't recommend going above 100%).

/qh share
Toggles objective sharing on and off. When on, will share quest objectives and progress with other party members that are using QuestHelper 0.17 or higher, and also have sharing enabled.

/qh solo
Will disable quest sharing and ignore anyone you might be partied with, basically assume you will receive no aid from your party members.