Simplified weapon table

I suspect houserules of this sort are fairly popular.

Weapon types:
Small/light (forearm sized): d4. 1 inventory slot. Easily concealed.
If it works in melee, it can most likely be thrown 15 feet.
If it's thrown, it most likely works in melee.
If it's ranged, it can fire up to 30 feet. Ammo stacks up to 10.
Examples: Dagger, darts, hand axe, shuriken. Sling, hand crossbow, blowgun.

Medium (arm sized): d6. 2 inventory slots. Can be used by all but Magic-User.
If it's ranged, it can fire up to 60 feet. Ammo stacks up to 5.
Examples: Club, mace, rapier, spear, shortsword, flail. Shortbow, light crossbow.

Large/heavy (leg sized): d8. 3 inventory slots. Can only be used by Fighter.
If it's ranged, it can fire up to 90 feet. Ammo stacks up to 5.
Examples: War hammer, greatsword, greataxe. Longbow, heavy crossbow.

Huge (man sized): d8, reach, d6 in very close combat. 4 inventory slots. Can only be used by Fighter.

Examples: Polearms, pike, lance.

Exceptions and special weapons:
Unarmed attack: d2, d4 if you're a Fighter or a non-MU using something like brass knuckles.
Javelin: a Large/heavy weapon, which only deals a d6 but can be thrown with a range of 30 feet.
Whip: a Small/light weapon which deals a d6, but cannot bring a target below 1 HP in normal combat, and only affects creatures that can feel pain.
Riding lance: a Huge weapon which deals a d10 and has reach, but is treated as improvised unless you're riding.

Some rules:
You take a -5 to the roll if:
-You attack with a weapon you can't use
-You attack with an improvised weapon
-You use the weapon in an improvised way (bashing with a bow or shield, throwing a sword)
-You fire a ranged weapon in melee
-Your target is beyond your weapon's range (-5 per 30 feet beyond range, cumulative)

Improvised throwing weapons have a range of 15 feet.

Potential combat styles:
Fighting with two weapons: You roll the damage die twice and take the best one. Each weapon must be Small. If you're a Fighter, each weapon must be either Small or Medium.
Fighting with a free hand: You get infinite item interactions. (You can open the door, close it, toss a friend a potion... as long as it could happen during the round)
Fighting with a shield: You get the extra AC the shield provides.