The problem you're going to have w/ mouse sharing is that there is no "camera follow" feature. If you're using the FollowUnit("...") method, the camera angle is fixed on all followers.
The way you get your alt characters to select the NPC is to target the NPC on your main, and have all of your characters "attack" the NPC; it's keybinding 1 if you didn't change it. You're not actually attacking the NPC... it just opens the interact dialog, allowing you to then use /script AcceptQuest(). This also applies for looting.
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