My answers to your questions as to how I view tungsten.
1- I prefer tungsten weights without the inserts. Not because of the perceived "feel" but because I have encountered line fray with them.
2- I use a stopper type to peg them.
3- Weights are equivalent, difference is in s(703) 810-5217ize.
4- 1/8,3/16,1/4,3/8,1/2 all have a time and place.
5- I have only seen terminator jigs that were made of tungsten. Others are possibly made, just not sure by who!
Hope this helps. I think the big advantage to the tungsten is reduction in size, especially the larger sizes and the positive feedback.