I don't care about jump shots, I don't think jump cues should be used. Too easy and take away from safety play and when players make a mistake. Jump all you want with the playing cue.
I also don't like cue extensions much either. Play position to reach the shot or use the bridge. There should be rules for cues same as for cueballs. You can't change the cueball for a smaller one to go through a gap if the regular cueball won't fit. WPA and BCA should set stands for cues, not too long, not too short, and you use your playing cue through the match, except to break so you don't damage your playing tip.
Learn to play a tighter safety where they can't jump.
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