I have been able to chat with the chefs at our local curry house, now as we eat there with a table of 20 once a month they have become very accommodating.
Lime or lemon it's all down to your preference as there is set rule!
(Edit) lemon is the norm in bir as I stand corrected.
I use raw room temp chicken as the restaurants only precook for speed not flavour, if u think about it when u precook chicken it's practically cooking in a curry juice

I'm not in a hurry when I cook and it only adds another few minuets to cooking time.