You can enable the "Record 404 page hits" option in JoomSEF's Configuration on the 404 Page tab. But it will only record a 404 when it's first accessed by someone, so it can't automatically check your URLs.
The /view being added is a bug introduced in the 3.0.10 version. We've released a new version 3.0.11 which fixes it.
There wasn't any change in 3.0.10 regarding the categories handling, but I've found out that categories were not handled at all in our extension if you used the Products menu item type instead of Categories, so maybe that's the problem. We've added a support for categories for Products menu item type too in 3.0.11.
I still don't know what causes your comments not to work. The shop/reviewsave.html seems to be all right, so if your other SEF URLs are working I don't see a reason why this one isn't. Is the SEF URL set as Enabled in the URLs Manager?