I have the following set up as shipping options:

Modules Sort Order Action
Flat Rate flat
Free Shipping Options freeoptions
FREE SHIPPING! freeshipper
Per Item item 1
Per Unit perweightunit
Store Pickup storepickup
Table Rate table
United Parcel Service ups
United States Postal Service usps
Zone Rates zones

Only per item is enabled atm.

I am not sure what you are referring to about the generate button, could you give me a little more detail about that?