This has most likely been covered b4 but here goes.

Is it always necessary to reverse 8-10 feet when switching back to 2hi? (as per owners manual). the 4wd light goes out a few seconds after switching the shifter, does this mean the hubs are already disengaged?

When driving in patchy ice(100 yds heavy ice - 100 yds dry pavement) is it ok to leave it in 4 hi? or does this cause binding problems?
it seems a pain to switch every few minutes.