Configuring iPad Mail app & Gmail app with different accounts?
I have figured out a way to do this that will work for me.

I already had my Gmail account added in Mail, calendar &amp; contacts settings but with mail turned off. Once I turned mail on and did a test of sharing a page from Safari, I noticed that I now had access to the From header; the default was my work address but I could change it to my personal one. Checked settings again and found a Default Account setting; changed it to my personal account and now it's using that as the default for sharing via email. I can still use the Gmail app to work with my personal mail, while the Mail app has access to both accounts.