Yes, that's what the first two rounds are used for. and each player has to be trustworthy and select his own players himself.
So, if you can't make it, you need to select your two keepers at the top of you queue, players 1 and 2. that way, as long as nobody else select the players, you're guaranteed of the computer selecting these two people for you.
If someone forgets to set their lineups [we'll call him criminal] and selects someone elses keepers [we'll call him the victim, then the victim will select the criminal's keeper, and they'll swap keepers in a trade after the trade.
so let's say you have LeBron as a keeper and I have KG. You forget to set your lineups, and you're gone, and you accidentally select KG. I will then select LeBron, and after the draft is finished we'll make the 1-1 trade so the keepers are properly placed.
Once keeper submissions are in I'll post an excel file online so there is quick access to who should be selected where in case this happens.