It would be very convenient to be able to just "open" public keys with GPA and
have it show the "import" dialog, not the usual "file manager" one. Or at least
have an option to "Import keys" in the "File manager". It should be pretty easy
to see that the opened file is an "armored" public key (at least for those; I'm
not sure about the format of "unarmored" public keys format), and so it probably
needs to be imported, not decrypted. It is much easier than clicking "Import
keys" and go look for those keys, especially if you're trying to import a public
key from an email attachment (yes, I know about Enigmail, but Thunderbird is not
the only popular mail client out there, not to mention web interfaces).