I miss all the old items and the complexity they added to the game and below is a list of ones that I think should come back. Let me know what you think:

Lightning Flash
(+50%,Flash-Effect)
#Limit 1
#Price 2500
"level" "15"
flashup

Fireball
(+8,Dmg)(range)
#Limit 1
#Price 4000
"level" "30"
fireball
Flamethrower
(30%,3sec-Burn)
#Limit 1
#Price 5000
"level" "30"
flamethrower

Mole Protectant
(get no damage from mole'd enemies, goes away when you shoot at them)
#Limit 1
#Price 1000
"level" "0"
moleprot

Heavy Boots of Armor
(-30% speed, +50H/+100A)
#Limit 1
#Price 1600
"level" "0"
heavyboots
Helm of Clear View
(-50%,Flash-Effect)
#Limit 1
#Price 2000
"level" "12"
helmview
Helm of Protection
(-5,Dmg)
#Limit 1
#Price 3000
"level" "5"
helmp
Secondary Weapon Enhancer
(+20 clip)
#Limit 1
#Price 400
"level" "0"
secweapon
Dust of appearance
(uncloaks enemies/disguiser!)
#Limit 1
#Price 1500
"level" "0"
dust

Longjump
(wide range jumps/bunny jump)
#Limit 1
#Price 10000
"level" "0"
longjump

Ring of Armor
(+120A)
#Limit 2
#Price 1200
"level" "0"
ringarm120

Death book of XP
(20 additional XP for each kill)
#Limit 2
#Price 3000
"level" "0"
morexp

Book of XP
(75 XP, +30 XP for every round)
#Limit 1
#Price 5000
"level" "8"
bookofxp

Book of Cannibalism
(10-20HP for each killed enemy)
#Limit 1
#Price 4000
"level" "0"
cannibalism

Disguiser
(Enemy-Model) (1 round)
#Limit 1
#Price 2000
"level" "0"
disguiser
Life Preserver
(+50H/100A) (used on buy)
#Limit 1
#Price 3500
"level" "2"
lifepres

Tome of Health
(+100H) (used on buy)
#Limit 1
#Price 5900
"level" "0"
tomehp100