When you loot an item inside Raids you have 2 hours to trade it to other raid members
During ToC it is common thing to distribute loot after killing last boss, as this Raid is short enough and it not only let people just finish raid faster in fast flow, but helps to prevent Pugs people from leaving raid Early.
However it is not possible in other raids, especially on Progressive realms, stopping the raid flow in middle of it to roll for items before timer runs out.
People can be very inpatient novadays and looking to cut corners everywhere, so my suggestion would be to increase That timer.
My guild usually raid for 3 hours and i am very sure other guilds raid for even longer, not to mention "One more try" moment, so i was thinking if we could Double or even Tripe the Trade window timer, so people can easly distribute all loot After finishing whole Ulduar for example - With not need to worry about timer running out and forcing raid to take a break.