Giorgio Tani - 6 days ago

Thank you for reporting, the Delete from archive entry does not show its keyboard shortcut (nor does the Move to trash entry), I'll fix it in the next version.

About extra options in system's context menu, this is a duplicate of what is described in issue 917.
In the original issue you can find the explanation for this behavior:
"PeaZip can handle many container formats which are basically archives with custom extensions, and also trying to parse arbitrary files as archives, this choice allows to conveniently handle them from the context menu (I understand it is not optimal if the user does not want to)"