I love the fact that, if you have built enough houses to keep building times down, *any* building that takes less than 5 minutes to complete can be completed instantly. But would it be possible to have the same instant completion available when there is less than 5 minutes building time *left* until completion? It's often frustrating to check in on a hero when you have limited time available, to find that the building they've been working on for the last 10 hours or so is now down to less than 5 minutes left... but you still have to wait for that remaining 5 minutes. Which could mean having to leave the hero, knowing that they're almost complete, but it might be several hours (or even a couple of days) before you can log back in... all wasted possible build time.
If we could instantly complete at that point, and set a new building in motion quickly before having to log out, it could make a big difference to productive time for those of us who really have to dip in and out of the game as and when we can.
And I don't think it would make a lot of difference to the number of manuals used/ purchased.
What do you think?