I’m not seeing the page 7/8/9 problem you’re talking about with the applied fix / upgrade to 2.1.5 — so I’d guess it’s your server configuration (‘Unable to allocate xxxxx bytes’ / php memory_limit setting).
Agreed on the Approve/Delete comments bits … It’d be great to be able to “Select All” and delete 50 comments at a time … Of course, rather than that being a function incorporated into Akismet, it’d be a bit cleaner to just have Akismet Queue use the regular Comment system …