You're actually asking 2 questions here:
1. How to use the tool
2. Where to run the engine
Can't speak to number 1 as I've never used it, and for number 2, I'll point you to Mike Busch's webinars on leaning and let you determine what's best for you:
Leaning Basics --
http://bcove.me/xcda4t0b
The Advanced Class --
http://bcove.me/a5aclj5p
I apologize for the evasiveness, but I just don't want to get involved in a ROP vs LOP discussion which can be somewhat continuous. I will say I run WOT LOP in cruise and leave it at that.