Thanks for all your feedback.
Just to clarify what kind of user parameters i am looking for.
I need to find a way to set default values for MRP control parameters in MD01 and MD40 (Processing key, Schedule lines, etc.). i thought that they might be affected by user parameters (System-User Profile - Own Data - Parameters), but i don't know for sure.
Also, i'm just a planning specialist, and unfortunately i do not have access to many programs you guys been advising me to go (same as nobody in my company has access to SQVI because of policy