Some questions.
1) I have most of the MMM and FWE plugins in use. I also have Mez's merged patch. I hear that I won't be needing MMM's plugins now. Is that true?
You still need the MMM DLC plugins and the FWE-MMM FOIP Patch. What you dont need is the Increased Spawn, Hunting&Looting, No creature xyz plugins. All that stuff is configurable through the menus.
And Mez's merged patch is simply a regular merged patch out of FO3Edit, it doesnt replace any plugins. It's just there for people who dont want to create a merged patch themselves.
2) I want to restore the backpack for Gauss Rifle (which hides my backpacks). Which file I am to change? FWE's O:A patch or Mez's Merged patch?
Uh the gauss rifle http://extralives.files.wordpress.com/2008/12/fallout_3_gauss.jpg. Or am I missunderstanding you?
3) I see that I need to reset MMM's in-game setting every time I play. I want lesser spawns but I don't remember to set so every time. Now you once told me a way of changing the setting in MMM's plugins, but I don't remember which one it was.
Either you are using an outdated version of the MMM-FWE FOIP patch, because you dont have to set this setting everytime, you only need to do it once. Or you are loading MMM plugins behind the FWE-MMM plugin(which shouldnt be the case as our plugin should load below the other MMM files).
This is what the MMM block at the bottom of your load order should look like:
Mart's Mutant Mod.esp
Mart's Mutant Mod - DLC Anchorage.esp
Mart's Mutant Mod - DLC The Pitt.esp
Mart's Mutant Mod - DLC Broken Steel.esp
Mart's Mutant Mod - DLC Point Lookout.esp
Mart's Mutant Mod - DLC Zeta.esp
Mart's Mutant Mod - FWE Master Release.esp (FROM FOIP)