I disagree about the jump cue. It is a skill just like making a good safety. Lots of people can jump, but jumping well and making the shot and getting a good leave is a skill. I love watching someone jump with skill.
Two different things, jump shots OK, trick jump cues NOT, that is what the general feeling is on here and also with the pro players. The pros just use them because they are allowed to, so they have to use them to keep on even ground with a guy they play that does use one. Most feel personally that the jump cue should be banned. Kicking and jumping with your playing cue is where the skill is.
I never use a jump cue, when I was playing around with my son's cheap jump/break cue (think I got it for $40) I was hopping over pretty much a full ball 100% of the time. He even asked me, "how can you jump so well when you never try jumps?", the reason is that those jump cues take away about 90% of the skill and practice you need to execute a jump shot with your playing cue.
I agree about the safety and kicks being very key at top levels, there was a great game between Reyes and Archer that involed a long safety battle on a hill hill game that took about 15 safety shots to finish. At one point there were 11 safeties played in a row. The game was decided by a ball hitting the point of a corner pocket instead of going in or going past the point on a 3 rail kick. If it went past the point by a mm it would have ended up safe, a mm the other way and it would have gone in.