Kay,
I don't remember right now, but I think you can set them up exactly like you want. As I described before, go to Database | Tender Types | go into a Tender and the press F1 Help screen, look at the Scan Codes section. How to program a single key for each tender type.
Hold the Ctrl, or for that matter, the Alt, the Shift, etc. keys down while hitting the other key.
Yes, you can control the Delete button function through security. While in POS, click on the lower of the two blank buttons, a lock should be displayed. F7 and go to the Customer screen. Press Ctrl+S, the buttons on the right will have blue boxes surrounding them. Click on the Delete button, check the security level that you want to use. Do a Ctrl+S again, escape back to the POS screen and click on the lock again.
Now set each cashier to that Security level you just set and the Delete button will be grayed out for them.
You could also do it from Manager. File | Security | and then repeat the above process. Database | Customer | Ctrl+S...