In Scenario 1, I would regretablly have to fold this hand (sad, I know). with A 10, a good hand but no reads and you being second to act (I'm guessing thats where you wanted the player to be) I would probably fold anything less than QQ, KK, AA... I know that some people are going to say "limp you idiot, you should never not try and see a flop with A10" or have something to say about my folding, but that is what I would do. As this is the first hand, me being the second to act, even in six players, I would want to see at least one-three hands where I could get a fast read on other players and hopefully figure out the best way to get into their head.
In Scenario 2, however, I would have to say I would probably raise to 4bbs if there were a bunch of limpers, but again this depends on position. KQ suited is one of my favorite hands (as sad as it is for an 18 year old, I love Pinnochle, which I somehow learned before poker). Here the flush draw is nice, two running broadways, and the fact that I juist love this hand too much to fold to anything but an exhorbitant raise puts this as an easy raise to steal some blinds, or go up against Arags on the flop and see who can hit and outplay for the pot.
Scenario 3, I would probably just plain and simple call here. Again this goes back to what I said up in Scenario 1 about me hating to play hands while I just sat down, but with only 3 villians and AK in my hand, I don't think that paying to see the flop on the first hand would be outside my limits.