what is a full panel proposal?::
What is a "full panel proposal"? Whatever you want it to be :-) Panels are intended to be treated as a more flexible space than papers in which to work. So if you want a panel of 3, fine, 6 would also be fine - though you wouldn't get any more time.
A panel proposal would consist of an abstract of up to 500 words outlining what the panel is, the problems it will address, expected participants and general approach. If the proposal is accepted we would then expect that to be worked up into something more substantial, for instance 500-1000 words from each participant around the panel theme/problem.