I do clothes as one wash. Nappies as one wash. Towels, tea towels, and sheets as one wash. But only when its a full load. I'm pretty anal about full loads LOL! I don't separate colours... sometimes I do soak whites in nappysan with Jazzy's stuff (we soak a lot of Jazzy's bibs and suits after an unfortunate banana staining incident!).
Powder. Just chuck it with the clothes. Underneath or on top doesn't matter to me, the swirling dissolves everything. I also do fabric softener.
I cold wash everything unless its a super dooper delicate item that MUST be washed warm.
I couldn't be bother turning things inside out, then I'd just have to turn them back around again when I fold! They go in the machine the way they are in the basket, I just tip the basket into the machine!
Pants are pegged by the waist. Shirts are pegged by the bottom. Jazzy's rompers, and our undies, socks and bras are pegged two to a peg. Everything else gets one or two depending on how it stays on LOL and if i run out of pegs I peg share.