In reply to mmmhumous:
youve basicly listed a large part of my job description.
id focus on team work in regards to simplifying and speeding up the bigger picture of a day climbing:
packing ropes, setting belays, bringing up 2 climbers, keeping an eye on each other, knowing who does what when and why.
use the instructor to be the drill sergent to observe and check while the group refines its team-function and group-think. 1 instructor between 6 will make for pretty lame quality if he/she is in a guiding role, but as a quality control element you will get more from them.
nailing together a primed, cohesive group will pay off hugely the following day, really maximizing your learning time by reducing the faff and fcukery common to all gaggles of winter climbers.
simply having experienced each other in action (rather than standing in line behind a guide) is half your day sorted.
also nice for the guide, who is possibly dreading taking on a whole mob (there may actually industry rules as to guide/instructor to client ratios...)