Other posts have answered your question but I need to chip in - are you
really sure you want to do this? The setting of effort driven and
non-effort driven shouldn't really be considered global properties. In
fact, it can change several times for a given task over the course of
developing the plan depending on what kind of resource edits you're making
at the moment. I think of it as a switch setting that you, the PM, can use
to insure project recalculates the right thing when you add or remove people
from a task. If you have someone painting a wall and add a second painter,
effort driven is usually appropriate since 2 painters will get it done
quicker than one. OTOH, if you're sending people to attend a presentation,
non-effort driven makes more sense since a 1-hour presentation will take 1
hour regardless of whether there's 10 or 100 people in the audience.