[jbeta]

This may be obvious, but might be useful. :/

Working weapon IDs:

0 Unarmed
2 Golf Club
3 Night Stick
4 Knife
5 Baseball Bat
6 Shovel
7 Pool cue
8 Katana
9 Chainsaw
10 Purple Dildo
11 White Dildo
12 Long White Dildo
13 White Dildo 2
14 Flowers
15 Cane
22 Pistol
23 Silenced Pistol
24 Desert Eagle
25 Shotgun
26 Sawn Off Shotgun
27 Combat Shotgun
28 Micro Uzi (Mac 10)
29 MP5
30 AK47
31 M4
32 Tec9
33 Rifle
37 Flame Thrower
38 Minigun
41 Spray Paint
42 Fire Extinguisher
46 Parachute

Working, but very prone to crash:
39 Sachel Charges
40 Detonator

Weapons that show on the spawn selection screen, but will crash your game:
1 Brass Knuckles
16 Grenades
17 Tear Gas

Weapons that don't show on the spawn selection screen, and will crash your game:
18 Molotovs
44 Nightvision Goggles
45 Thermal Goggles

Weapons that lock you in first person mode (/kill won't get you out):
34 Sniper Rifle
35 RPG
36 Missile Launcher
43 Camera

Edit: Removed Satchel Charges & Detonator, based on personal experience and this post.