Multiple signatures and forwarding from a first signer to a second

Hi,
Ive been digging through these forums and its been extremely helpful for creating my forms, now Im hoping that you all can solve another problem I've encountered. Here goes:

I am trying to create a form that is filled out & signed by the first user (after which the fields become locked) and then can be forwarded to another supervisor who can then review the fields, add their own signature and then email the form to the collector.

I think that the multiple signatures can be done by changing the read only properties of all of the fields except the 2nd signature field using the "postSign" action (I think action is the correct term) but am a little unsure. Can anyone clarify if this is the correct way to go?

The forwarding issue is a little hard I think. Is it possible to create a button that will open an email message where the user is required to input the email of the second signer? The other way that I can think of doing it is having the first person save the file and manually email it to the second signer as an attachment who would then open, sign and submit to the collector. This way would be a little simpler, but I'd like to try and keep the whole thing contained within the form if possible.

If anyone can help me with either or both of these issues that would be awesome, Ive done a bunch of digging and havent been able to figure out these yet.

Im running LiveCycle Designer 8.2.

thanks in advance for your help