I love this mod and use it in my Youtube playtrough of Minetest. It suffers from two issues though, one you (the mod author, really hate that English doesn't have a separate word for singular and plural "you" like Polish does) can't really do anything about and one you apparently can.
The issue #1, one you can't do much about, is lack of texture pack support for the mod.
The issue #2, the one you apparently can, is add a support for moreblocks' circular saw. This is something I've thought needs to be done on the moreblocks part, but apparently the mod author needs to register any blocks that can be cut using the circular saw with moreblocks. So I would like this mod to support moreblocks' circular saw so that I can cut all the new wood and stone types into neat shapes and build my house with them.
The Ethereal mod is a must-have for Minetest as it improves the terrain generation so much. It also introduces many new cool blocks that would benefit from better textures (none 128x+ packs I have seen seem to support it).