Some ideas to enhance this area:
Be able to link multiple promo codes together. For example, we have a holiday promotion right now, all codes have the same "name", but since the codes are unique, I have four pages of promo codes for one promotion. This could get out of hand easily
Be able to view promotion uses and other analytics. For example, when you have codes that are one-time use, you currently cannot tell from the promo page which have been used and which are still unused and "active".