Racing NiMh cells will discharge over a short period of time (lose there 'punch') and after they go below a certain voltage they can be damaged permenantly
a slow charge is much better for them, yes and they will hold there charge better but by charging them at like 1a as a posed to 5a you will not get the voltage spike out of them which makes the car accelerate.
An equalising tray keeps them in good order as each cell goes out of balance through charge/discharge cycles, an equalising tray brings them back together again.
No real rule of thumb for wiring a switch i dont think, i believe the switch is in the BEC circuit going to the Rx, but not sure. I dont run a switch and am happy with it like that, always reminds you to take your cells out.
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