There's so much stupidity in this thread it makes my head hurt. I believe I have seen you in S/P so why dont you go back and read the FAQ again and again.
When did you ever hear any of us praise the benefits of laying on our back when lifting weights? in fact we all say that bench is probably one of the lesser lifts when it comes to overall body strength.
Limit strength will help improve efficiency of your CNS and Muscles in helping you become stronger ...plyometrics/olympic lifts will go a long way as well once you've established a good strength foundation...
For me personally deadlifts went a long way in improving my vert. I added over a foot of vert while adding 40 lb since the end of HS....Other with big verts do squats(including jump squats), deadlifts, olympic lifts, plyometrics(box jumps, depth drops, various hops, etc...)....
most of the improvement will come from strengthening your hips, glutes, lower back, hams, and calves(hence why deadlifts, powercleans, snatches, etc work so well).