theres already a large assortment of low level quests for players, especially new players. Running most of it on solo/norm can easily take you out of the harbor.
Challenging short quests would be much better served at lvl cap. Little exp, and maybe one end chest that has a really low chance of dropping some named loot and you're set.
What I miss is the 5 - 10 minute quests that proliferate the harbor and market being largely extinct from higher levels. And I'm not talking zerg fests here, b/c you can zerg the harbor stuff in 1-2 minutes, and some of the higher stuff in < 10 as well.