This enhancement would enable all sorts of additional functions - for example properly making bookable rooms a 'thing' in Koha rather than using Bib records incorrectly for rooms. The new class of 'space/location' could be a sub-division of a 'branch' potentially.
This bug is related but different I think: https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=27340