I'd love to have more control over sorting and filtering all the conversation threads. Specifically, I'd love to have a way to filter my conversations by whether or not I sent the last text. (So often I read a message then forget to respond because the conversation gets buried under newer conversations. It'd be so nice to quickly parse out the conversations between whether the convo is waiting on me or them.) I find the static newest-conversation-on-top isn't always very useful.