The Elder Scrolls IV: Oblivion:
Sneaking Realism v.1.3.

******WHAT'S IT ALL ABOUT? *****
The plug-in creates system of factors which will influence efficiency of Sneak.
Depending on these factors you will receive bonuses or penalties to skill "Sneak"
The value of penalties and bonuses will depend on your Sneak skill.
The plug-in expands system of 5 steps of skill "Sneak". When you'll be becomes more professional in art of Sneaking, penalties gradually can turn to the bonuses.

The plug-in does not use any harmful spells! Plug-in based on essentially different approach to management of the Player skills

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Details:
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Version 1.3.2:
Script was optimized
Version 1.3.:

1. Is no penalty on use a torch in Sneak-mode
(Influences of light incorporated in Engine of the Game is enough)
2. Multipliers sneak-attack are increased (Look below)

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Factors and Sneak-skill Steps:

1) Novice («Sneak» less than 25)
Wearing a cuirass: Heavy Armor -7 Light Armor -3
Weapon Out in Sneak-mode: Two-handed: -9; Bow: -8; One-Handed: -6

2) Apprentice («Sneak» from 25 to 50)
Cuirass: Heavy Armor -6 Light Armor -2
Weapon Out: Two-handed: -8; Bow: -7; One-Handed: -5

3) Journeyman («Sneak» from 50 to 75)
Cuirass: Heavy Armor -5 Light Armor -1
Weapon Out: Two-handed: -7; Bow: -6; One-Handed: -4

4) Expert («Sneak» from 75 to 100)
Cuirass: Heavy Armor -4 Light Armor: Does not influence
Weapon Out: Two-handed: -6; Bow: -5; One-Handed: -3

5) Master («Sneak» more than 100)
Cuirass: Heavy Armor -3 Light Armor: +1
Weapon Out: Two-handed: -5; Bow: -4; One-Handed: -2

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Does not depend on skill "Sneak":

Sneaking without cuirass +3 always
Sneaking and be ready to hand-to-hand fight -1 always
Sneaking with Shield (Light or Heavy) -5 always

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Sneak Attack:

Damage multipliers for successful sneak attacks have been increased to the following:
Novice: x5 melee / x3 marksman
Apprentice: x6 melee / x4 marksman
Journeyman: x8 melee / x5 marksman
Expert: x10 melee / x6 marksman
Master: x12 melee / x7 marksman

****** KNOWN ISSUES *********
It is not recommended to use "Sneaking Realism" together with any With any plug-ins which modify Sneak skill

******* SAVED GAMES *********
No new game is required to play the plugin.
The plug-in is created on the TES CS v.1.2. And should work on any version of the game
************ REQUIRED **********
Only Oblivion it is enough
Version 1.1.511 or later