Changing Parameters (Not a n00b Question)

[Kizzy]

This is not a question about how to rename parameter stats which is in the Database under System

I would like to know if it possible to completely delete certain stats from the game, namely MDEF and PDEF and add in a new parameter as defense instead of dexterity.

I don't want defense to be controlled by the equipment rating, I want it to be a character parameter that grows just like Agil/Int/Str when they level up.
  Dexterity controls hitrate as I beleive, so this is different than renaming it as "defense". I would like for defense to control defense, not the hitrate. Is this possible? Can i change what the parameters control aswell?
  I tried removing MDEF from Game_Actor but it gave me an error. Is it possible to change the game's own script or is there a script I can add in which can change the parameters?

[Kizzy]

I'm sure theres somebody here that knows what to do

[Tenraah]

You can change the damage formulas in your game scripts.  I'll figure it out for you if you like, but I need to know how you want your hit chance to work.  Do you want it to just be a set hitrate for all attackers?  Then agility would make some characters nearly unhittable at higher levels unless you remove that from the calculations.

In the script Game_Battler3, go to about line 50, unless you've changed stuff in there already, and replace this line:

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atk = [attacker.atk - self.pdef / 2, 0].max
with this:

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atk = [attacker.atk - self.dex / 2, 0].max

Then go to around line 130 and change

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power -= self.pdef * skill.pdef_f / 200
power -= self.mdef * skill.mdef_f / 200
to

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power -= self.dex * skill.pdef_f / 200
power -= self.dex * skill.mdef_f / 200

Then go to around line 233, change

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recover_hp += self.pdef * item.pdef_f / 20
recover_hp += self.mdef * item.mdef_f / 20
to

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recover_hp += self.dex * item.pdef_f / 20
recover_hp += self.dex * item.mdef_f / 20

These will change the damage calculation and make dex your main defense stat, but it won't change hitrate or remove defense from item stats.  I'll get to that in a minute...

EDIT:
Go to the script Window_EquipLeft and erase the following lines:

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    draw_actor_parameter(@actor, 4, 96, 1)
    draw_actor_parameter(@actor, 4, 128, 2)
...
    if @new_pdef != nil
      self.contents.font.color = system_color
      self.contents.draw_text(160, 96, 40, 32, "->", 1)
      self.contents.font.color = normal_color
      self.contents.draw_text(200, 96, 36, 32, @new_pdef.to_s, 2)
    end
    if @new_mdef != nil
      self.contents.font.color = system_color
      self.contents.draw_text(160, 128, 40, 32, "->", 1)
      self.contents.font.color = normal_color
      self.contents.draw_text(200, 128, 36, 32, @new_mdef.to_s, 2)
    end


Go to the script Window_ShopStatus, line 68

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        # If weapon
        if @item.is_a?(RPG::Weapon)
          atk1 = item1 != nil ? item1.atk : 0
          atk2 = @item != nil ? @item.atk : 0
          change = atk2 - atk1
        end
        # If armor
        if @item.is_a?(RPG::Armor)
          pdef1 = item1 != nil ? item1.pdef : 0
          mdef1 = item1 != nil ? item1.mdef : 0
          pdef2 = @item != nil ? @item.pdef : 0
          mdef2 = @item != nil ? @item.mdef : 0
          change = pdef2 - pdef1 + mdef2 - mdef1
        end
        # Draw parameter change values
        self.contents.draw_text(124, 64 + 64 * i, 112, 32,
          sprintf("%+d", change), 2)
change to

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        # If weapon
        if @item.is_a?(RPG::Weapon)
          atk1 = item1 != nil ? item1.atk : 0
          atk2 = @item != nil ? @item.atk : 0
          change = atk2 - atk1
          # Draw parameter change values
          self.contents.draw_text(124, 64 + 64 * i, 112, 32,
          sprintf("%+d", change), 2)
        end

Go to Window_Status, line 31 & 32.  Delete them

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    draw_actor_parameter(@actor, 96, 224, 1)
    draw_actor_parameter(@actor, 96, 256, 2)

After all of that, PDEF and MDEF should no longer appear anywhere in your game menus.  However there will be a little awkward empty space in the status window for each character.
Another thing I'll add: While you're making skills or items in the database, just use PDEF-F or MDEF-F to decide how much dexterity will affect the skill.