Feature suggestion: Virtual Folders or Search Folders
Management of aliases can be messy if you get several ones based on different uses (like a personal and a pro one, which you may not want to check in the same situations, like weekend).
I understand there is no separate inboxes.
What about a more powerful feature: a search virtual folder. Like a filter rule sending emails to a folder but, instead of moving or copying, it would just filter (like the unread virtual folder but for our criterias, like the receiver address of a mail, which we could configure to a particular alias).
In some way, it could work like the tags or labels of gmail.