Bukkit

Configuration

The default configuration file will be generated if it doesn't already exist.
It looks like this:

explode:
    power: 4.0
    prevent_block_damage: true

Description

You can - at this time - only define parameters for the kill type 'explode'.

With explode.power, you set the power of the explosion, where 4 equals the power of TNT. 0 will only generate a fake explosion that does not harm anything. I warn you from using powers of 40+, I just killed a jungle hill (and my computer) with it.
With explode.prevent_block_damage, you can select whether to harm blocks when generating an explosion. If it's set to true, no blocks will be destroyed, but there will still be dealt damage to entities like mobs and players.