Add support for custom entries. For example blocks etc.

What entries do you mean? It would be helpful if you explained in detail what you want to be done.

Custom blocks - modded blocks.
Entries - custom files for modpack dev. (I am a developer of mocpack)

I am sorry, but I am still not 100% sure what you mean. If you mean like to add more mod content related to blocks, this is currently being done and more are on the TODO list.

Ok