I am all for casual gamming but I am sorry I just don't see the need for this type of feature in DDO. For me having the optional XP earned on the spot helps groups continue to move forward even if they don't have time now to complete the whole quest.
And I'm one that spent 5 hours in a ELITE VON3 back long ago my first time through when XP death penalty existed and shrines could only be used once, even the raise shrines. It took us 45 minutes to get to the end fight, and the rest of the time to beat the boss - no TR, no TWINK and even then after I completed I walked out 1 level lower then when I started. Sure we should of just quit after the 3rd attempt but boy was it fun .