Feature request - cache digital signature checks

[utdpauls]

Each time you view a new message for the first time, and that message has a digital signature, a modal dialog box appears asking you to click on Accept & Save, etc., etc., or simply saying "Signature verified as good" and requiring you to click on OK.

It would be nice if Mulberry would cache those answers, at least for the same session, so that you don't have to accept the same signature over and over again. If something changes about the signature, then it would be appropriate to be prompted again, but the constant prompting for the same issue gets annoying. On some lists, the same people post repeatedly, and each time the prompt appears.