If it's about farming, delete a character and create a new one specially for farming, leaving all quests open, except the mandatory for the storyline.
Sure, this requires some investment in time and gold to do, but does the job.
If you don't want to delete a character for this purpose, the farming is not worth it for you
If it's about 'title farming', that's an other problem.
People that play the A Show of Force and Requiem for a Brain quests of LB/SS do this because it's one of the faster ways to get to maxed title.
Remember, both LB and SS give game advantage, so higher titles do count here.
When you do this without these farms and don't have a decent DoA profession, it takes a lot longer.
DoA quests are already repeatable and net somewhat more LB points.
However, there are lots of PuGs running the Force and Requiem quests, it's not hard to find a group for it.
So there is no need to complain about having those quests finished, just find a pug.
While I understand the viewpoint of the initial post, I don't like any of the options.
If I have to grind for my maxed LB title because the required points are insane high and I manage to do get those with less than a full party, I'd expect some decent drops for it. While the SS/LB run is even possible with 4 players (and finishing the last part with 3) it's a matter of calculating what you want most. If you want the title fast, join a full group, else join a 5-person group.
This would come closest to the 'repeatable quest', however, when I get my max LB, I want to finish the quests once and for all.
I'd like to se more possibilities to get SS and LB points in a rate of let's say half of the Force and Requiem quest but with interesting stories or activities attached.
So that it's worth playing and accepting the reward instead of mindless repeating of the same quests.
Sure, the regular quests do net some points, however, the gap between the max-1 and max title are 15000 -> 50000 and 25000 -> 50000.
Given the time to finish one quest and the very limited LB reward on the quests compared to time, the current ones are just not worth the the effort compared to the SS/LB farms.
I don't mind playing the game and quests for ages to get to a maxed title.
Even if the quests are repeatable (thinking about GWEN dungeons for example). It's at least a year to GW2 release, so plenty of time.
I do mind being almost forced to do nothing else but mindless killing of numerous enemies with the sole purpose of maxing a title.