iOS 6.1 Jailbreak: Queries

So I'm all set to jailbreak my 3GS running iOS 6.1. So right down to it, I've got some questions: 1. Will this require the IPSW in my PC? The 6.0.x jailbreak software did. 2. I've been reading around for a while, but to no avail, on this: Is it possible to set the Gmail app as the default mail client after jailbreaking? That's it, really. Thanks.