message without subjects should read "No Subject"
images in emails and attachments scaled smaller or auto-scaled
roundcube auto checking for email and notify on page (like gmail does with page title and inbox count)
address book should hold more information
wish you could open emails in inbox with single click like items in folders menu (doesnt work in firefox 1.5 atleast)
could message count disappear when not reading emails since it has no functionality?
documentation with installation guide: options to change timezone autoset and hide charset menu in compose screena

wishful thinking:
automatically show timezone configuration screen on first login (maybe check sql tables to see if data exsists?)