Yep, infra-red and heat-seeking are one and the same. About firing only one AIM-54 aka Phoenix at a time, it's not solely semi-active - it switches to its own guidance as it closes on the target. There'll be a little timer reading 'ACT' at the bottom-right of your HUD - when that reaches zero the missile switches to its own guidance and you're free to drop the lock/ fire another. If your target is close enough it may impact before the countdown ends but really in that situation you should be using another missile; AIM-54 is a long-range missile, one of the few in the game, and is best applied in that role.
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