While in Lavastorm you can use the following commands.
To get any Norrath's Keepers task use:
/lua run taskfaction good
Conversely to get any Dark Reign task use:
/lua run taskfaction evil
To get a task from a specific wayfarer use any of the following (in this case we get a task from Wayfarers Mercenary Bitra):
/lua run taskfaction bitra
/lua run taskfaction "Mercenary Bitra"
To use this script to complete a task you already have in your quest journal use:
/lua run taskfaction task "quest name"
For example, if I want to complete the task Blood Money after I have already picked it up I would do:
/lua run taskfaction task "Blood Money"