Yes, Saving raid compositions would be nice, even if its only one raid composition. Making it easy to change would be important too, I think changes happen more often that having many different raid compositions.
Yes, filling in the first slot with the players info would be nice, although I guess that it would be nice to be optional.
Yes on the Anti-Nub, explanations on how things work is nice, even if you understand it there can be something learned there.
Yes, I like the layout, however it would be nice where the classes are listed that the buff/debuff sections be expandable/hidden.
On the warning, something mild would be ok, If someone didnt understand that buffs dont stack most of the time I would just want to be sure that they not think that somehow that the buff was no longer any good.
oppylock, there is a add-on called raidbuffstatus at
www.wowace.com that makes the raid leaders job easy by doing that check for you if your interested.
I also agree that it should maybe update.... or offer to update the current raid buff tab for those curious as to what they might be missing. I am guessing this is a completly optional method and very nice to envision. I really like the
idea and the mock layout. I hope to see this soon :)