Talk to the pit boss where you play. I know some pit bosses are mor generous than others. Even within the same casino, one pit boss may be more "liberal" than another.

At the craps table you will be rated on all bets except even odds bets (like betting behind the line). The stupider the bet, the more you'll be comped. If you always bet the "hard ways", "any craps", etc (the bets in red) you get more comp credit than just a line bettor.

Believe it or not some pit bosses will credit you for betting both ways at the same time. For example, on the opening roll, if you bet $100 on "Don't Pass" and $100 on "Pass", there are some pit bosses who will give you credit for a $200 bet. Be sure to ask before betting.