With the implementation of a back office erp system many to the features asked for here would be handled.. Stock management, PO's Etc. and all accounting needs. I personally like frontaccounting at: http://frontaccounting.com/ Features could be added to Chromis POS that would allow a connector to be built that would sync data back and forth.
If is this something that others would like to have, then I could at least be willing to start by writing some specifications.