Hills can be rather beneficial during GPP ??? I like them. However, starting mechanisms or acceleration angels are seldom of a concern for jumpers ??? mostly I have found the problem the opposite; jumpers tend to rush the beginning (they tend to be quick in this regard) of the run and put themselves in trouble when they reach their top speed too early (momentum at the board is lost). Thus, we want a smooth runup, and therefore I also like to see jumpers do longer runs than their actual runup. I find ins-outs to be beneficial for this purpose (and I would also place them under the category of MaxV since the practical distance seems to require between 60-80m, sometimes up to 100m).
A short-to-long vs. long-to-short approach might not be as absolute as sprinters tend to prefer; rhythm and jumping is of concern for jumpers. To put it simply; ins-outs and some 100-150m (once n a while) are very functional in teaching relaxation. They also do wonders for your metabolism as well as in keeping components rotating.
Regarding the transition phase towards SPP, the biggest change tends to be longer/faster approaches in the actual jumping. This is a rather profound change regarding intensities and recovery (for the micro cycle), hence moving towards much more MaxV at the same time ??? and also intensifying weights at the same time (let???s not forget the change there also) ??? might turn out to be too drastic of a change. Therefore, I like to see sprint volumes and sprint-distances shorten during such transition.