Corewood has different snapping, which is useful. You can stack corewood horizontally, such as for log cabins. This also gives you a 0.5m snap height to align other things to.

Unfortunately, this doesn't suit your purposes here.

The devs could do a lot to make things even more flexible -- such as arbitrary angles and more snap points -- but I think they have a nice balance here of minimalist features and pieces which offer a lot of creative flexibility. If they made corewood just like other beams, that would remove some of it's special value and just be another "skin". If they added more snaps, it could make corewood troublesome to use.

It might be cool to have a general option, during placement, for a local snap-coordinate space -- an alt mode like Shift which centers a snap-grid on your current selection, with 0.25m snap increments in the local +/- x/y/z. This would remove the need to abuse WoodDoors for these offsets, and allow stacking all wood types (though not seamless because they aren't as thick as core), or offsetting the corewood default to line up end-to-end with other wood. This would also avoid polluting the number of snap-points in a build, as they're only "virtual" -- placement offsets.

I'm sure there are other ideas which could be even better. So long as the wonderful balance of simplicity and flexibility isn't upset!