gmail as default mail app?

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I use gmail as my default mail app on my phone. I have it set up to get email from two of my other email accounts and push it to my phone.

Under the contacts on my phone it has a part under each contact to view email conversations with them.

The only problem is that it will only show email from the mail program and it will not show the email from the gmail app. Is there a way to change this to show my gmail emails?

Also is there a way to compose new email in gmail on the hero using a certain email address for its reply. So I can use gmail to collect my email from all my accounts but if I want to send an email from a certain account and not my gmail, can I do that?