does jumping over the ball constitute interference?
Maybe, maybe not....I know this sounds like a cop out, but this is really something that needs to be seen on the field to judge whether or not it is interference.
Interference is a dead ball the instant it occurs and is called. We don't wait to see the outcome of the play to determine interference. The "intent" of the runner is not relevant, umpires are instructed to judge actions, not try to read intent.
If a runner stutter steps or tries to time their run as to be directly in front of a fielder as the ball is there, that COULD be considered an act of interference. As with almost every scenario involving interference, it needs to be seen to give much more than an opinion. Even at that, several people may see different things on the same play and come up with different rulings.