Angled vertical half-slabs would allow for considerable wider variety in the type of structures that could be created. It's something I've always wanted out of Architecture Craft and Carpenter's Blocks, as long as I've been playing.

Just a note that EpicSquiddo promised this.

Would this be a framed slant with 1/2 the slope for a less steep roof? If so, that would be very useful!

Perfect! I hope @EpicSquid has it on the development plan, would be amazing!

That is my intent, yes!