by Gornemant 2011-05-06, 21:42
This might help:
http://forums.bukkit.org/threads/fun-higherexplosives-v1-6-configurable-multiworld-explosion-control-740.6228/Features:
Control the size of explosions for TNT, creepers and ghast fireballs.
Control the percentage of dropped items (called yield) from the destroyed blocks, from no items dropped through to one item dropped per destroyed block.
Optional prevention of terrain damage
Multiple world configurations
Allows configuration of different blast radii, with different probabilities for each being chosen
Allows configuration of different player damage (optionally with different probabilities for each being chosen)
Allows configuration of different creature damage (optionally with different probabilities for each being chosen)
Item damage can be configured (optionally with different probabilities for each being chosen)
EXPERIMENTAL: Fuse length of TNT can be tweaked.
Some simple control over which areas the modified explosions will happen in
Control creeper, tnt and ghasts explosions (I really miss the ghasts, the nether is so boring :< )
I'd say remove all terrain damage, decrease blast radius and increase damage, ;D