Answer of question 1: If you want to allow outbound connections from the outside to the inside ( Higher to lower security level interface) yes a PAT will work for that.
Answer of question 2: If you do not have nat control enabled you are not translating anything so what would be the purpose of the Nat 0, now the whole idea of the NAT 0 is DO NOT translate this, so why would you use a global for that, so NO there is no global on the nat 0.
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Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...