Not sure how possible this is, but it would be nice if a config was provided to create custom material dimlets. Say, the end user puts in the name of the block and the metadata, and then a dimlet is created in-game for that block.

E.X.:
Say I want to create a "Manganese Block" dimlet. I would place in the config:
OresPlus oreManganese 0

Which follows the format:
modid name metadata

Obviously you could change the format for whatever would work best for you, but I'm just using that as an example.

You are supposed to be able to define your own material dimlets in config/rftools/userdimlets.json. However, when looking at this I think it is currently broken. I'll fix it.

Fixed in next version. The format for userdimlets.json will be:

[
["material", "minecraft","planks",5],
["material", "minecraft","planks",4]
]

i.e. that means: type (currently only material), modname, blockname, metadata