Purchase Order number sequence and tax

Would love to request two changes in the Purchase Order Module:

  1. PO number sequence is always in PO-1 and increments. It would be nice to have our PO number sequence that increments, instead of always defaulting to the PO-xxx.
  2. Tax reverts to zero and has to be added everytime. Make this a optional setting that the admin can add once and doesn’t need to add manually for every PO created.