Changes in Better Morrowind Skills; first number is default value, the second is changed value. This mod also changes Argonian waterbreathing ability to permanent effect and encumbrance multiplier for Strength form 5 to 50 for better item management. If you dislike some of these changes just disable them in TES Construction Set by Open -> (select my mod - Updated Morrowind - Skills.esp) -> click Details -> select desired variable to disable -> press Delete -> choose Yes
In a separate file min and max chance for blocking have been changed to 50 and 90. Chances for enchanting are also increased.

Acrobatics:        Jump (0.15 -> 0.25)
                            Fall (3.0 -> 5.0)

Alchemy:            Potion creation (2.0 -> 2.5)
                            Ingredient use (0.50 -> 0.75)

Alteration:          Successful cast (1.0 -> 3.5)

Armorer:             Successful repair (0.4 -> 2.8)

Athletics:            Second of running (0.02 -> 0.05)
                            Second of swimming (0.03 -> 0.20)

Axe:                     Successful attack (1.2 -> 1.1)

Block:                  Successful block (2.5 -> 4.0)

Blunt Weapon:    Successful attack (1.0 -> 1.2)

Conjuration:        Successful cast (1.0 -> 6.5)

Destruction:        Successful cast (1.0 -> 1.5)

Enchant:              Recharge item (5.0 -> 6.5)
                             Use magic item (0.1 -> 0.5)
                             Create magic item (5.0 -> 8.5)
                             Cast When Strikes (0.0 -> 0.5)

Hand-to-hand:     Successful attack (1.0 -> 1.9)

Heavy Armor:      Hit by opponent (1.0 -> 1.8)

Illusion:                Successful cast (1.0 -> 3.0)

Light Armor:        Hit by opponent (1.0 -> 2.4)

Long Blade:         Successful attack (1.0 -> 0.9)

Marksman:          Successful attack (1.0 -> 1.6)

Medium Armor:   Hit by opponent (1.0 -> 2.0)

Mercantile:           Successful bargain (0.3 -> 0.6)
                              Successful bribe (1.0 -> 1.3)

Mysticism:           Successful cast (1.0 -> 2.0)

Restoration:         Successful cast (1.0 -> 1.5)

Security:               Defeat trap (3.0 -> 7.5)
                              Pick lock (2.0 -> 5.0)

Short Blade:         Successful attack (0.75 -> 1.00)

Sneak:                   Avoid notice (0.25 -> 0.75)
                              Successful pick-pock (2.0 -> 4.0)

Spear:                   Successful attack (1.0 -> 1.7)

Speechcraft:        Successful persuasion (1.0 -> 4.5)
                              Failed persuasion (0.0 -> 2.5)

Unarmored:          Hit by opponent (1.0 -> 2.2)

All changes are made for balancing purposes. List of all changes is included with mod.

Check out my other mods for Morrowind, Oblivion, Skyrim and Skyrim SE:
mithrilarmor