What I think the rule should be: On straights a driver cannot drive in a manner that forces another driver to either leave the track, lift off the throttle or brake to avoid a collision.
Much simpler than the one-lane-change rule that was invented in 1995 when Damon Hill was fed up with Schumi's antics and demanded a rules clarification. Ironically it was exactly this new rule that, from then on, allowed Schumi to chop other people and then say: "hey, the rules allow me to chop once!" Before the rule, everyone knew it was dirty.