Couple of Craps Questions

[bosoxx05]

Hey guys, justs tarted learning craps and have played a few times but I still have a couple of questions.

1) Tipping- The past couple times I've played at $5 tables and have placed a $5 bet on the pass line for the dealer whenever I tipped. The other night I played at a $10 table, am I allowed to place a $5 bet on the pass line for the dealer or does it have to be $10? I ended up putting a $10 bet on the pass line, but that seemed expensive to me.

2) Free odds line/ I've played at 2 casinos, one let you bet 5x when the point was a 6 or an 8, 4x on a 5 or 9, and 3x on a 4 or 10. The casino I played at the other night, you could only place a 2x bet no matter the point. What's an optimal amount to bet on the free odds line?

Also, if there is one what's the popper strategy for pressing your bets?

Thanks