For what it's worth Jeryy, my two penneth from what i've seen and done myself
Finger chillis used predominantly in this neck of the woods rather than bullet chillis.
Finely chopped and added midway or a the end of cooking to provide nothing more than additional heat. If added earlier the heat is lessened but the TASTE of chilli comes through in the final dish. Possibly these may add a little chilli flavour but minimal heat
Also used whole towards end of dish cooking to provide colour in the dish as well as optional heat should one choose to eat them with the dish.
Kashmiri - no experience of using them, as it seems difficult to determine whether the chilli is infact Kashmiri or a larger dried red chilli. So one for me to try and report back on.
Dried red. Have had these used in phall dishes and refered to by staff as black chillis - dried red chillis simply fried. Adds a lovely heat to the oil and therefore dish and a lovely nutty unique flavour to the curry itself, as well as a considerable amount of heat.
Love using a dozen of these to bagghar the oil when i'm doing the simple dhall recicpe on site. Gives it a splendid growing background heat which really makes the dish for me.
Crushed / roughly ground dried red chillis. Like to add these to really heat up a dish and give it some bird seed texture as Bengali bob would say. This was used regulary along with fresh green chillis in my phall. I posted a thread on the Padma phall which explains the recipe
As for Mr Naga, and possibly ones own superhot chilli pickle (Viceroy Abbots Langley "naga" sauce) and addition to increase heat and add a little bit of a different flavour to a dish.
Finally, the extra hots. Never had a dish served in a restaurant using these recently. This would probablly be the sort of thing used in show pieces like "the widower curry" and all the other "man versus curry" dishes that seem to exist nowadays. Not even sure what chillis they used when i did my "curryhell" challenge at the Rupali in Newcastle all those years ago.
What i do know though, is that for us chilli heads, dishes can have increasing desirable heat levels by that addition of super hots as well as them giving the dish a unique "fruity" flavour. I like to make a naga phall. Ten naga chillis finely chopped. Half added at the tarka stage of the fry and the other half added to the end dish stage. This seems IMO to provide a good heat as well as a good flavour addition to the curry, without the need for chilli powder ;D
As for bullet chillis which seem to abound in some areas, i've only just started to see them in local supermarkets, never in asian grocers down here. To me they are milder than finger chillis and will add a little heat depending at what stage of the cooking process they are added. They also seem to provide a nice bit of colour in the dish itself, full of heat promise, but sadly lacking
