Describe the feature

It's pretty simple. Just basically a slab divided like a sandwich to where you can have a sort of "quarter slab" look. Would be nice for making things like countertops or other things

It's not entirely clear to me what you are looking for. I can think of four different possibilities:

• A slab-like block that is only a quarter block high
• A half-block high slab split into two quarter-block high parts
• A full block split into a quarter-block high part and a three-quarter-block high part
• A full block split into four quarter-block high parts

Can you elaborate on what you specifically mean?