Plugin has been implemented, although it is not going to be cheep. I have linked it to iconomy so you will have to pay credits to change your spawner type.
 
The commands are:
 
- /MBox - This will display the types of mobs you can choose from.
 
- /MBox Set <Type> - This will change the type of the spawner that you are looking at.
 
- /MBox Get - This will tell you what type of spawner you are looking at.
 
Listed bellow is the pricing in credits:
 
- Chicken = 75000.0
 
- Cow = 75000.0
 
- Creeper = 50000.0
 
- Ghast = 50000.0
 
- Giant = 150000.0
 
- Monster = 50000.0
 
- Pig = 100.0
 
- PigZombie = 50000.0
 
- Sheep = 175000.0
 
- Skeleton = 100000.0
 
- Slime = 100000.0
 
- Spider = 50000.0
 
- Squid = 50000.0
 
- Zombie = 50000.0
 
- Wolf = 75000.0
 
- CaveSpider = 50000.0
 
- Enderman = 50000.0
 
- Silverfish = 50000.0
 
Some thing to remember when you place or change a spawner type is that just because you place a spawner there does not mean that it will spawn the mob. The general conditions for spawning a mob still apply. ( Zombie's and skeleton's will not spawn in saylight etc... )
								The commands are:
- /MBox - This will display the types of mobs you can choose from.
- /MBox Set <Type> - This will change the type of the spawner that you are looking at.
- /MBox Get - This will tell you what type of spawner you are looking at.
Listed bellow is the pricing in credits:
- Chicken = 75000.0
- Cow = 75000.0
- Creeper = 50000.0
- Ghast = 50000.0
- Giant = 150000.0
- Monster = 50000.0
- Pig = 100.0
- PigZombie = 50000.0
- Sheep = 175000.0
- Skeleton = 100000.0
- Slime = 100000.0
- Spider = 50000.0
- Squid = 50000.0
- Zombie = 50000.0
- Wolf = 75000.0
- CaveSpider = 50000.0
- Enderman = 50000.0
- Silverfish = 50000.0
Some thing to remember when you place or change a spawner type is that just because you place a spawner there does not mean that it will spawn the mob. The general conditions for spawning a mob still apply. ( Zombie's and skeleton's will not spawn in saylight etc... )