Just curious, has anybody ever setup a CSIN different from "blank" or "I"

We are looking at possibly setting up a GAP and an NON-Gap set of Cost Methods. The GAP method would be used for all inventory and accounting functions. The non-Gap would primarily be used to help price items for sales by GPM. The current thought would be to setup a new CSIN value of "S" and change related programs and reports to pull that CSIN instead of the "I" which is used now for Sales and Inventory.