1. If you're talking about most of the old quests (done previously) disappearing(in Ep4), that's done on purpose. All your choices made in previous episodes will be taken into account if you start playing from a save made at the end of ep3. See the
FAQ for more details on this, specifically
1.4.26. When it comes to
choices in dialogs, nothing much has changed. In most choices, you can either refuse to continue or agree to continue. This has always been the case, so this question is better addressed to the developer).
2. Which "block" in ep4 are you talking about? If you are referring to the mandatory Extra content activation, it was implemented back in episode 3. See the
FAQ ( 1.5.12 ) for more details on this, as well as the previous pages of this thread, where links to the free Extra scenes activator have been posted multiple times. As for the small amount of content, it's not true, there is a huge amount of it in the game, and you're unlikely to find an adult game developer that can match the performance and total number of renders and animations of Decent Monkey.
3. Not a fan of this branch, but there seems to be content with Misty (in ep3). Another thing is that there are quite a lot branches in the game, and it's not possible to cover them all at once.