1. The stock "sad eye" lights on the Hardbody pickups are the same as the Pathfinder lights AFAIK. If you convert your front end to the smaller rounded rectangle headlights some HBs used (more options available because it's a size used by many other vehicles), you'll need the buckets and grille to match (I think the corner lights are different too). You can also get clear turn signal lenses and corner lights if that's your bag. I haven't seen aftermarket tail lights for these (and no, the HB ones won't fit) but I have seen guys put slotted covers or spray-tint over them to make them less effective.
2. At least one guy I'm aware of has cracked the ECU and figured out how to get a little more power out of it. He's on the NPORA Facebook page.
3. VG33 swap with the cams and intake from the 3.0 (swapping the intake means the electrical system just plugs in and the ECU's none the wiser) is common and pretty well documented here. So is auto to manual swapping. If you want to go crazy and have the resources, you can build the hell out of a VG, turbo what's there, or swap in something completely different. V8Path managed to squeeze a Chevy V8 into his.
4. Unless somebody's been into it before, you have the VG30E. VG is the engine family, 3.0 is the displacement (roughly), E means multiport injection.
There's a lot of good info in old threads on here. I usually just google "NPORA ..." with whatever I'm looking for rather than bothering with the forum search feature. Many pictures are dead, unfortunately, but there's apparently a browser extension that'll get you around some of that.