The APC method is an approach for estimating the importance of including selected orbitals in the active space on the basis of HF exchange matrix elements K ii and Fock matrix elements Recently, we have used an active space selection scheme built around this method to select CASCI active spaces for all molecules in the QUESTDB dataset. Here, we modify this scheme in two key ways: (1) we orient the method towards selecting active spaces for DMRG-CASCI calculations (without orbital optimization) instead of CASSCF, and (