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you may want to give it a try to this http://build.technicpack.net:8080/job/BukkitForge/
that proyect aims to brigh plugins into FTB servers, with allow you use WorldGurad to keep those creepers under control , note that it doesnt work with all plugins, yet. but can confirm that worldguard does work.
also there could be mods wich gives that funtion, but i dont know about these.
actually world guard does, the 5.5 one, 5.7 doesnt seem to work yet, and on latest build keepcalm fixed a small issue now wg works fine , tested on my server