Poker tournaments are poker tournaments. Multi-table, single table, rebuy, or shoot-out. There is one priority, and only one. Survive. This means that the first hour of ANY poker tournament should be devoted exclusively to the BIG starters. AA, KK, AK suited. Period. (Unless you're in the blinds and can see a "free"/cheap flop.) The maniacs are going to be feeding the pot when their small pairs and paints get busted. Let them. The percentages don't change just because it's a rebuy tournament. 44 or AJ is still a stupid all-in.
When I play a rebuy, especially a micro-entry rebuy like $1, I'll buy in and immediately take the first available rebuy. I'll then lay low, often only playing one or two hands, if any, for the first hour. Then I'll take the add-on at the first break. So, I've got three bucks total invested. I haven't squandered chips and rebuy money chasing trash, and I know I'm going to outplay 75% of the surviving field after the first break anyway. Let the donkeys build the rebuy pot with their loose play for the solid players like you to reap at the end of the day. I love it when the dead money makes a ton of rebuys and doubles the payouts that they have no shot at ever seeing anyway. Play just as tight in a $1 rebuy as you would if it were a $300 cash buy-in. You'll be way ahead of the field, and when the rebuy dust settles, you'll still be at the table. Which means you have a shot at the money. Simple, but effective.