Mod's menu suggests following options:
Fixed Models
Fixes the models ("hitboxes") of Sharp Axe, War Axe, Combat Axe, Sharp Sword, Axe, Scythe & Great Mace. Changes take effect after restart of the game.
Misc Fixes
Takes off camera twitching when the dwarf moves to the right.
Restores the ability of spiders to spit venom, which was lost during game development due to a bug in the code.
Gives proper icon to duke Kerman.
Fixes gargoyles texture in the Forge
Improves character's trajectory in cutscene in the Oasis.
Fixes weapons of orcs in cutscene in the Temple.
Fixes sound in Naglfar's animation of running without weapon.
Fixes the bug which made one of skeleton's attack didn't inflict damage.
Allows to skip first two scenes in Khazel Zalam.
Enables the lost briefing after Ianna's Temple if the Sword was activated.
Fixes the break of the last scene of Dwarf in Mines of Kelbegen in english version.
Fixes ear-destroying sound bugs in Island of Karum and The Abyss in 2021 reissue.
Fixes endless loop of Combate1 in The Abyss in 2021 reissue.
Drop Bows
Allows to drop a bow (like a shield). Adds medium and heavy bows to the maps of main campaign.
Adds fire arrows in the Forge in case of 2021 reissue.
No Corpse Hugs
Eliminates the stucking in the corpses of knights, orcs, skeletons, cositas, zombies and liches.
For Dwarf
New combos for Dwarf. 5 universal ones:
Sharp right (1.3x damage)        - AR + Rlvl3
Sinister left (2.0x damage)      - AL + Llvl4
Exterminator (3.5x damage)       - AL + L + Flvl5
Death of barbarian (2.0x damage) - AB + LRlvl6
Mill (2.0x damage)               - AB + LR + LRlvl7
10lvl combo for Venom Hammer (11.5x damage) - AL + FB
19lvl combo for Combat Axe (15.0x damage)   - A + FB
12lvl combo for Great Hammer (9.0x damage)  - AB + RF
Cyclone and combo of Fire Axe now inflict damage twice during animation.
For Barbarian
Adds 8 lvl Crushing weapon for Barbarian in main campaign and the ability to do back smash with two-handed axes.
Adds "ignore pain" effect to 2nd Great Fire Sword combo.
Adds more convenient combo for Scythe - AR + L
For Knight
Adds more convenient combo for Double Sword - AR + AR + F. 
Fixes combo of Queen Sword so it turns on damage at the same time with trail (similar to other characters).
Adds new combo for Fire Sword - AF +AF + B
Hawk Attack now inflicts damage twice during animation
F1 Pictures
Adds description of new combos in F1 pictures. Adds table of enemies' resistances instead of "items".
Beer & Ragnars
Adds beer mugs to the main campaign that can be drunk. Replaces several dark knights with ragnars.
"Way of Armina" doesn't go to inventory. Amulet in Al Farum is now Ghost Amulet.
Add "extended ending" in the Forge.
If NPCs kill each other the Hero gets XP anyway.
Pad-friendly Combos
Adds alternative sequences for combos which have FB and LR actions. FB -> R, LR -> L. It works for standard combos of all characters,
Mighty Dwarf Mod combos, Mighty Amazon Mod combos (if it's installed).
Fast Swap
Allows to toggle standard and fast weapon swap by pressing LCtrl.