landeck was correct in differentiating between slow chargers and trickle chargers. Of course, a charger can be both, switching from slow to trickle, but the 2 conditions are not the same.
It is quite valid to say that older generations of NiCd and NiMH cells could be charged at 1C and they would be quite happy with this, providing end of charge is managed correctly.
However, it was posited that the answer to battery life reduction caused by heavy current draw is to use higher capacity cells. I maintain, and I do know what I'm writing about here, is that modern high capacity NiMH cells are much more fragile than older cells. The increase in capacity is brought about by using thinner etched metal foils for the electrodes. By being thinner, the foils cannot accept currents as high as lower capacity foils without being damagingly heated. Low self discharge NiMH cells will lose no more than 25% capacity in a year, which is fine for a digital camera, pointless for RC applications, and they are even more sensitive to current draw, as I have found.
My experience of dealing with battery manufacturers is that they know only about 1/4 as much about their products as they ought to, and then they won't tell you what's really going on because it's commercially sensitive. So you get the same old drivel about "Charge at 1C until the end of time" because that's what GP batteries say, about everything.
I asked for capacity maintenance information from GP four months ago, for a professional application.....dum de dum de dum, .......still waiting. You need to take manufacturers' recommendations about fast charging under advisement; one thing is sure: if you use a slow charger and turn them off after 14 hours, you won't damage the batteries.

So, I will be charging my packs on a slow charger and turning then off when they're charged