Nope, it was not intended - but the game was supposed to be nonlinear and I guess, the Larians couldn't think up of all possibilities gamers would come up with.
BTW, some of it has been fixed due to the latest patch - mainly designed to remove questbreakers. And I added the valid links in the questbreaker quest further down the thread, ok? <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Kiya