Do to the way themes are setup Menu and Reply are not even in the same file. I will see what I can do but most likly if I try to move it, it will want to say shown on every page and not just in threads.

I'll work on blank space some more search page is a very odd page setup seems to have more spaces then other.

You should be able to see and download attachments just not add them minimalist isn't suppose to do 100% of what main theme does.