I think I want the GAL browsable feature.
http://bugzilla.zimbra.com/show_bug.cgi?id=5989
When I click TO, I want the contacts that are in the selected addressbook or Global Address list to show without me having to search for them. I'm still looking through the code to see if I can fix it without waiting. I'll make sure I post my findings.
Thank you for showing me this bug.