Hi Capricorn,
As some users do not want to use flightcrew and instead want to use epubcheck or do the validation outside of Sigil, or not at all, flightcrew is not officially part of Sigil anymore and was moved to a plugin.
Since the set of plugins a user has installed is specific to that user, the plugin menu is built dynamically for that user on the fly. As it stands, many people do not bother to use or install flightcrew, so there can be no single button/icon to launch it.
You can simply use the plugin menus to launch it. Given the flightcrew's validation occurs on the entire ebook, filling the validation pane with all of the errors, there really is no need to be running it more than a few times on any ebook.
If, instead you are looking to find and catch simple editing mistakes in an xhtml file, you are better off using either sanity-check or turning on Preview which will provide almost immediate feedback on the problem issue.
At some point in the distant future, we plan to add 5 user assignable buttons for common plugins but that point has not come yet and won't until we get some basic epub3 features supported.
KevinH
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