Are the mods the same version as the pack? Can you post a console log? Are the files in the /mods folder?
Configs are .txt files the mod uses to identify how to work, etc. They are located in the ftb install folder/monster/minecraft/config. Find the config you want to change, open it up with notepad, and change what you want to change. Be sure MC is closed, save it, and relaunch. BE CAREFUL! Pay attention! Configs can be tricky, and can easily break a mod if edited incorrectly. Editing these is not for the faint of heart.
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Punching trees, falling off cliffs, punching grass... Now that i think of it, Minecraft sounds painful.
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