No, there is no update on my proposal.
Technically grouping by subject is a little different to a conversation. Although they usually have the same subject, a conversation is a series of messages that are replies or forwards related to an original message, but the subject can change and still be grouped. In other email clients this is sometimes called a threaded view, but as far as I know eM Client is the only one that includes messages from all folders in the thread, including the Sent folder.
If you don’t want to use conversations you can disable that feature in Menu > View > Conversations.
You can choose the way you want to sort messages by clicking on the Sort by Received column header.