[Batfish]

Some of the best on-road carpet drivers in the northeast race at my local track and I can tell you that they dead-short their GP3300 packs regularly. This gives them more punch at the cost of reduced run-time. The drivers don't care about the run-time much since they never have a race longer than 5 minutes and GP3300 cells will give them nearly 10 minutes of run-time.
Generally they dead-short the cells as part of regular maintenance until the pack no longer gives them the punch they want. The pack will then either become a practice pack or they get rid of it.
Some of these drivers are sponsored and don't pay for their packs, mind you. I personally won't dead short because I want the run-time out of my packs and I don't drive well enough to notice the loss in punch from a well-used pack.