But the devs are constantly working on a patch. The development of the 1.3.5 patch start right after the 1.3 patch was finished. It's not like they do nothing and check the rain on their office windows in between patches untill someone says "oh darn, we still have to make a patch!"
We have a dedicated beta testing team, who test the patch between every build. There comes out a build every friday, which we test and we give feedback on that.
About the ideas topic - we already have the bugreport and the many suggestion topics. The dev's also look on the forum and when we are pitching ideas together, like the ferry pack, they ask the forum staff what the community really wants. Some ideas are not feasible, and other ideas/requests make it into an update, patch or pack. The Coromuel and the InCat is a very good example of that.