Diablo – Is it possible to disable camera bumping

Any character (including wizards and witch doctors) can wield any non class-specific weapon, with a few small exceptions.

The class-specific weapons are:

• Ceremonial Knife (Witch Doctor)
• Hand Crossbow (Demon Hunter)
• Fist Weapon (Monk)
• Daibo (Monk)
• Mighty Weapon (Barbarian)
• Wand (Wizard)

There are also off-hand class-specific items, as well as class-specific armor.

In addition to the class weapons, a few classes are restricted from using certain general items. The restrictions are as follows:

• Wizard: No polearms or two-handed maces (other two-handed weapons are OK)
• Barbarian: No staves, no ranged
• Demon Hunter: No two-handed weapons other than bows and crossbows, some skills restricted to ranged weapons.
• Monk: No ranged
• Witch Doctor: No special restrictions

The idea behind having wands for Wizards is that the magic enchantments on them are particularly beneficial to the Wizard so it's more likely you'll be using a wand if you care about general Wizard stats or skills. You are otherwise, however, free to use whichever general weapon you want.

According to Bashiok:

...faster speed weapons consume more resource but may do more damage. Channeled skills might still be better with slower weapons though because on a channeled skill, you have as much mobility as you want, so the "mobility" and "overkill" advantages of faster weapons are eroded with channeled abilities, so all you’re left with is increased mana cost for increased damage.

So yes, a faster weapon will cause more skills to tick faster, resulting in you dealing more damage over time, but will result in you using up more resources as you are channeling faster.

Channeling mechanics

Let's use Ray of Frost as an example,

Cost: 20 Arcane Power

Effect: Channel a beam of frost that deals 215% weapon damage as Cold.

Since this is a channeled skill. The resource cost ticks by 10 and drains that much Arcane Power at twice the speed of your weapon. If your attack speed is 1 attack per second, instead of draining 20 Arcane Power once per second, it will drain 10 Arcane Power every half seconds.

Additionally, Since Ray of Frost is a channeled spell. It is broken down into many small attacks that deal a total of 215% weapon damage based on your attack speed. If your attack speed is 1 attack per second, it will deal a total of 215% weapon damage per second.

tl;dr: The faster the weapon attack speed, the faster the drain; slower the weapon attack speed, slower the drain.

Damage-dealing

Assuming two weapons have the same damage, the faster weapon will use up resources faster than the slower one when channeling, but the faster weapon will take less time to do full damage than the slower one.

• An axe at 15 damage and 1.0 attack speed will drain slower. (15 DPS)

• A wand at 15 damage and 1.5 attack speed will drain faster, but will do
  the same damage faster. (22.5 DPS)