First off, great plugin! It's by far the best one out there for category-based email lists.
I've been configuring this plugin to work with category (segment)-based subscriptions. I've found a bug where if a post is assigned to multiple categories, the API only requests MailChimp to mail an email to the FIRST segment in the segment/category list.
For example, if I have categories in my AutoChimp plugin that correspond to segments (with the same name):
And I send to all 3, then it only sends to users in the Alpha list. If I select Bravo and Charlie, then it only sends to Bravo.
Is there any easy way to fix this? If it's a limit of the API only supporting one list, it should be rather simple to tweak it to support multiple callbacks, rotating through the selected lists. I haven't the MCAPI documentation in-depth, but in theory it should be a rather simple logic fix.