Sorry but I really disagree. If you want to see if any of multiple files have semantics set, you can simply look at the content.opf (as Doitsu so nicely demonstrated) or the Nav in epub3, or use the Reports feature in either epub2 or 3.
If you just want to check the semantics of just one file, any of the above will also work and so will simply mousing over the file in the BookBrowser (or using the arrow keys as BetterRed pointed out).
Actually invoking set semantics on a file is not the same as it was before where a shortened list of Semantic items was built into a menu. Epub3 semantics are much much richer, and the way the gui was changed to handle that now allows us to soon extend epub2 semantics with the "other" prefix on types that old Sigil did not allow but that are perfectly valid.
In the long run there are plans to add a new window that will show the metadata manifest properties and any associated semantics in a separate window for the highlighted (current tab) xhtml files. That way additional information included in the metadata manifest properties needed for epub3 have a nice home right alongside the semantics.
Either way, taking a page from Kovid's playbook ... "I am not interested in that feature but if someone else wants to implement it (without losing any functionality), I would be happy to include it in a future release."
KevinH
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