FireSpell toggle

Prerequisites:
/scoreboard objectives add SneakTime stat.sneakTime
/scoreboard objectives add Sneaking dummy
/scoreboard objectives add Drop stat.drop
/scoreboard objectives add FireSpellItem dummy
/scoreboard objectives add FireSpell dummy
/scoreboard objectives add FireSpellToggle dummy
/scoreboard players set @p FireSpellToggle 1

Repeating/chain command blocks:
/scoreboard players set @a[score_SneakTime=1,score_SneakTime_min=1] SneakTime 4
/scoreboard players remove @a[score_SneakTime_min=2] SneakTime 2
/scoreboard players set @a[score_SneakTime_min=2] Sneaking 4
/scoreboard players remove @a[score_Sneaking_min=1] Sneaking 1
/scoreboard players set @a[score_Drop=1,score_Drop_min=1] Drop 4
/scoreboard players remove @a[score_Drop_min=2] Drop 2
/execute @a[score_Sneaking_min=1,score_Drop_min=1] ~ ~ ~ scoreboard players add @e[type=Item,r=4,c=1] FireSpellItem 1 {Item:{id:"minecraft:dye",Damage:14s,tag:{ench:[],display:{Name:"Fire Spell",Lore:["A magical Dye","That can cast a fire"]}}}}
/entitydata @e[score_FireSpellItem_min=1] {PickupDelay:0}
/execute @e[score_FireSpellItem_min=1] ~ ~ ~ scoreboard players add @p[score_Sneaking_min=1,score_Drop_min=1] FireSpellToggle 1
/scoreboard players set @a[score_FireSpellToggle_min=3] FireSpellToggle 1

[score_FireSpellToggle=1,score_FireSpellToggle_min=1] = off
[score_FireSpellToggle_min=2] = on