https://gitlab.synchro.net/main/sbbs/-/issues/1002#note_7830
The reason this feature isn't easy (and likely why it wasn't implemented before) is that it's not until a QWK packet has been successfully downloaded that we then would need to go back through the message bases and flag each message that was included in the packet as read. This is already done for the mail base (for email/netmail that was successfully downloaded via QWK) but not for the sub-boards. It's easier for the mail base because there are no pointers and the max-messages-per-packet limit likely wasn't reached, so all the mail is scanned for unread and marked read.
It's doable for sub-boards too, but not trivial.
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