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-Andrew
I find it really odd that you can only use/create them in in multiplayer, other than downloading a map from the server itself. Just why? Is it hard to add a directory with the custom blocks?
I intentionally made singleplayer barebones - don't see the point of trying to reimplement advanced stuff when a private server already does the job.
You're welcome to add the feature yourself, the client is open source.
I'd like to see a more friendly user interface for custom blocks "creator" when implemented in Singeplayer (but would be great if it could be used in MP as well, I guess it would be more work to communicate with server), but I see that such things are probably not high priority right now.