Everything damned said. I don't think the DCC ruleset has 'Turn Order-Reset' as a menu option. I usually just change the round to 0, and then hit the circular arrow button to start a new combat.
You can also duplicate NPCs in the combat tracker by grabbing the shortcut icon (brown circle at the far right of the entry) and dropping it anywhere in the CT frame. Of course, you need at least one other summoned creature in the tracker to do it that way. Maybe you could drag the NPC record to a hotkey as a backup option.
I don't know about the targeting issue. I feel like it shouldn't matter if you have a token on the map for an NPC to target a PC, but maybe I'm wrong. Try it and see what happens.

