Some asked about a statement from CCP about warp timers, here it is:
Edit:
Personally I don’t like introducing an extra module to remedy permabumping.
If such a module is introduced, a generous cooldown timer should come with it, maybe 10 minutes. A freighter who just got away using this module should dock up asap and scout ahead or select another route since he obviously has the attention of pirates.
I took another approach on dealing with the issue of perma bumping (NOT ganking, NOT bumping to set up a gank - perma bumping) in following thread, maybe some would like to take a look: Bumping mechanics