The only idea I can get behind is more voice work but consider this, as much as I enjoy DM narration, I often have to turn it off out of necessity to hear voice chat of other players. Wouldn't the same problem exist with voice from monsters - that's a lot of wasted resources from Turbine.
In terms of cut scenes, open explorer areas requiring more travel time to quest read through the treads on Favorite DDO quests and most hated DDO quests.
http://forums.ddo.com/showthread.php?t=312418
http://forums.ddo.com/showthread.php?t=302501
It would seem many people are motivated by xp/minute (or lack there of) and annoyed by having to wait. Add cut scenes and you make people wait for their xp, add a long run to a quest through a wilderness zone ala 3-barrel cove and the majority will choose to zerg all 4 of the depths of doom/darkness/despair quests to maximize their xp per minute in the time it would take them to swim to Ghost of a Chance and back.