I commend you! But I am guessing your tongue
is really sore from having to bite it all the time! 
I was just in one yesterday and I had similar thoughts - "could I take a job here so I can make a difference?" PetCo is SUCH a big chain therefore much politics. That's when I couldn't keep my mouth shut and would get fired!
On the cham forum we have a few posters that work for chain pet stores and I just cringe at all their frustration! So again, you're a better person than I when it comes to this...I'll just try to make a difference in other ways 
I have to say, too that the Concord store and the Portsmouth store (NH) vary a lot. The Concord store is nicer, cleaner, the reptile area is right out in the open and looked much better. However, they had some pretty large herps in some small cages. Surprisingly the anoles had a double enclosure so they had more room. There was one anole in there, obviously older, who was very skinny and sickly looking - it just broke my heart. I thought of taking him just so he could live his last days with some dignity! UGH!!!!
As Matt said the males together is a big problem as is the food. It was obvious that some were getting the food and others weren't. Some were nicely green, plump and then there were the skinny, sick ones. The employees don't even KNOW if they are male/female so how can they separate? So you may want to really learn up on sexing so you can at least make an effort to keep them separated. You can point out that if females are in one setup and males in another the customer can choose what they want. This also gives the impression that they can all be housed together. So Mom, Dad and the kids take home three, one for each kid, and it ends up being 2:1 then they wonder why there are problems, why one is always hiding or not eating. The other problem with them all together is that you may very well send home a gravid female much to the dismay of Suzie's or Johnny's mother when little ones begin to appear!!
Oh, I COULD go on...sorry. OK, one last thought. When people buy reptiles, they should be in the CORRECT habitat that the new owner needs to setup at home. They should be able to look at one (because in theory the animal should be setup right) AND they should not leave the store without all the proper setup so they know the true cost of a $5 pet is...now I will stop.
PLEASE keep us posted and pop over to the Cham forum sometime to chat with some other pet store workers. Best of luck to you and again, I shake you hand "virtually.” Please keep us posted!
lele