Thanks for the kind words and encouragement
From what I understand, the official First Four games will have matching seeds (i.e. two 16's or two 11's or 12's, etc). You can also change these seed values from Preferences -> Teams tab.
And yes, you can use decimal values.
Another option is to use a combination of Seed x Weights and Basic. Then you can award a fixed amount of points (e.g. 10) for a correct First Four pick. (use values of 0 for all other rounds, for example)
Lastly, you may want to check out this link on First Four Options: http://officepool.pachysoft.com/firstFourOptions.html