To Adobe's credit: They deal with hundreds of tickets a day, and have a staff that is much larger than ours. It's easy to lose sight of a single thread when you have 20 more in your backlog. It doesn't make it ok, but I definitely feel for their team. They have it a lot harder than we do.
Anyway! Let's talk interactivity. For a very long time, we haven't wanted to implement a feature that couldn't be done in a PDF export. PDFs, after all, are one of the best ways to share mockups with your team, so building features that aren't PDF compatible didn't make sense. But, that being said, we recently implemented a back link function that doesn't work with PDFs. So, now that the seal has been broken, the discussion for other non-pdf friendly features are back on the table. Interactivity is a fine line to walk. We aren't a prototyping tool, so we want to make sure we don't over step our bounds. I will bring this idea back to the team and see if there is a middle ground we can find for it.
I do want to hear more about the first bug in your list. I know 3.3.3 had a bad duplicating assets bug, so let's get you on 3.3.6 to fix it. You can grab it here. There is still a bug that triggers the replace dialog if you are copying an asset with 2 mockups open. We are in the process of fixing that one.
I totally get your frustration, @aribilow. We feel some of it as well. Thank you for taking the time to tell us though - when I say it makes Mockups (and us) better, I mean it. Let me know if the duping bug is fixed with the latest update, and tell me if there are any other features you'd like see. You can email me directly, if you prefer, and we can chat there. My email is (surprise) firstname.lastname@example.org.
I hope we get to chat soon.